An armed passenger who barricaded himself in an Amtrak rail car outside Los Angeles Friday night -- forcing the evacuation of 187 passengers -- was finally apprehended after about eight hours after tear gas was released, police said early Saturday morning. 
 
 "Barricaded armed suspect on #AMTRAK train in custody after tear gas deployed. Area safe," tweeted the Los Angeles County Sheriff's Department's Special Enforcement Bureau at 2:19 a.m. local time. 
 
 Police were notified by Amtrak at 6:19 p.m. that passengers on board Amtrak # 790 -- traveling along the popular Pacific Surfliner route -- witnessed a passenger with a weapon, said Ramon Montenegro, a public information officer with the Los Angeles County Sheriff's Office Transit Bureau. 
 
 ABC-owned KABC in Los Angeles reported that the weapon was a gun, although police had not yet specified what the weapon was. 
 
 According to KABC, witnesses said the suspect appeared to be under the influence, or possibly had a mental health issue. 
 
 Train operators were instructed to pull the train into the station in Chatsworth -- located in northwestern San Fernando Valley in Los Angeles County -- and evacuate the train, Montenegro told ABC News. 
 
 When deputies arrived, the train was evacuated, with the exception of the car carrying the suspected armed passenger, who locked himself in. KABC reported that the train has also been isolated. 
 
 An Amtrak spokesman told ABC News, "Amtrak Train 790 -– the Pacific Surfliner service, operating from San Luis Obispo to San Diego –- is being delayed at the Chatsworth station for police activity. All 187 passengers and 5 crew have safely left the train and remain inside the Chatsworth station." 
 
 Amtrak provided buses to take the passengers to a new train elsewhere, but those who went were unable to take their luggage since it remained on the original train 
 
 There were no reports of shots fired. 
 
 Crisis negotiators and SWAT Team officers were dispatched to the station, Montenegro said. 
 
 Train traffic -- including both Amtrak and the regional Metrolink -- was temporarily stopped. 
 
 ABC News' Lucien Bruggerman, Anthony McMahon and Shelby Kimball contributed to this report. ||||| A possibly armed suspect was barricaded for hours inside an Amtrak train in Chatsworth Friday night, causing several evacuated passengers to be left stranded.Authorities received reports of a man with a gun inside Train 790, the Pacific Surfliner, at about 6:19 p.m. The train stopped at the Chatsworth and was isolated, according to the Los Angeles County Sheriff's Department.As of midnight, the suspect remained barricaded inside as deputies tried to bring the incident to a peaceful end.Dozens of passengers were left frightened - and stranded."Someone reported that he dropped a gun - likely was then reported to the train folks - and that's when things escalated," said passenger Allison Bird.Witnesses said the suspect appeared to be under the influence, or possibly had a mental health issue."I didn't know what was happening. I just saw two cops - one escorted us out and the other one had a shotgun and then they had, like, AK-47s out," said another passenger.Amtrak's Pacific Surfliner travels from San Luis Obispo to Santa Barbara, Los Angeles and San Diego.The incident is causing delays in other trains. Metrolink tweeted that its Ventura County Line 121 to Moorpark is stopped at Northridge. VC Line 119 to East Ventura had been delayed up to 45 minutes and VC Line 117 to East Ventura had also been delayed up to 90 minutes. VC Line 123 to East Ventura was held at the Van Nuys station.Check Metrolink's Twitter feed for the latest updates on train delays. ||||| Pandemonium erupted at Penn Station Friday after Amtrak police used a stun gun on an unruly man — sending scared riders scrambling for safety. 
 
 The transit hub was unusually crowded at rush hour thanks to an NJ Transit train that stalled in a tunnel earlier, causing massive delays to kick off the holiday weekend. 
 
 Cops confronted a man and subdued him with a stun gun around 6:30 p.m., sparking a stampede of frightened travelers who feared that a shooting had taken place. 
 
 Amtrak police subdued the man with a stun gun around 6:30 p.m., sparking a stampede of hysteric travelers. (Mary Altaffer/AP) 
 
 “We were sitting on the ground and all of a sudden we heard this loud noise and everyone started sprinting,” said 24-year-old Aubrey Moore. “It sounded like a gunshot, but nobody knew what was going on so I just sprinted.” 
 
 FDNY officials said 13 people were injured in the chaos. Amtrak authorities said the man was taken into custody. 
 
 MTA, NJ Transit rip Amtrak after Penn Station derailment 
 
 Video of the arrest shows cops pinning a man on the ground and placing him in handcuffs. 
 
 A look at the chaos at Penn Station after Amtrak police used a Taser on a man. Details: https://t.co/4eIk8Ak0k2 pic.twitter.com/RjcuwGX7NR — Eyewitness News (@ABC7NY) April 14, 2017 
 
 “Be advised, individual in custody, force used, individual was Tased,” one of the officers says into his radio. 
 
 The four cops were quickly joined by officers from the NYPD and members of the National Guard. 
 
 “I’m not resisting. This is only my mouth. I have freedom of speech,” the suspect tells cops. 
 
 Penn Station's limited service over derailment to go on for days 
 
 Hundreds of commuters waiting in Penn Station for service of the NJ Transit train to resume. (Sam Costanza/for New York Daily News) 
 
 Toward the end of the footage, a dazed-looking woman pushes past the cops shouting: “Where did my son go?” 
 
 Other videos, from networks covering the stalled train, show pandemonium erupting as panicked crowds pushed past one another to escape the underground hub. 
 
 Anna Renzi, 24, was waiting out a long delay on her trip home to Washington, D.C., with her family at Häagen-Dazs in the transit hub’s concourse when crowds began streaming by. 
 
 The stalled train cased up to 45-minute delays. (Sam Costanza/for New York Daily News) 
 
 “I thought I heard someone yell ‘shooter,’ that’s why I threw my nephew behind a counter and jumped over and they just had us hide in the storage closet because I had the kids,” Renzi said. “The employees were so awesome they just had us hid there until it was safe to come out.” 
 
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 Officials and the NYPD sought to assuage fears on social media after the stampede. 
 
 “Bad information. No shots have been fired at Penn Station. @NYPDMTS @NYPDSpecialops @Amtrak,” NYPD spokesman J. Peter Donald wrote. 
 
 “No shots were fired at Penn Station this evening,” Mayor de Blasio tweeted. “FDNY is on scene treating injuries that were sustained during panic.” 
 
 The incident was frighteningly similar to a scare last summer at Kennedy Airport when a raucous Olympic victory celebration sparked fears of a shooting. 
 
 Mets fan loses his mind after NJ Transit derailment causes delays 
 
 On Friday, cops also responded to reports of a shooter at Macy’s flagship store on 34th St., just blocks from Penn Station — but said there was no need to panic. 
 
 Caught in mass stampede for the exists when a tasing incident was mistaken for an active shooter in Penn station. @NBCNewYork Aftermath: pic.twitter.com/XxdpEoKgqq — Chris McClave (@McClave) April 14, 2017 
 
 “Additionally, we have responded to numerous calls for shots fired in & around @Macys on 34th Street in Manhattan. All are unfounded,” Donald added. 
 
 The disarray at Penn Station began when a malfunction with overhead power equipment trapped 1,200 NJ Transit commuters on a train heading into Penn Station for about two hours, officials said. 
 
 The stalled train, #3850 out of Trenton, caused heavy delays, about an hour, on NJ Transit service heading in and out of Penn Station, according to the New Jersey transit agency and commuters. 
 
 Riders went on Twitter to vent about the delays. (Drew Angerer/Getty Images) 
 
 The stalled NJ Transit train started its trek to Penn Station shortly before 6 p.m. once it regained power, according to executive director Steven Santoro. 
 
 He encouraged commuters on the train to contact NJ Transit with their complaints. 
 
 “We deeply apologize for your experience, and I would like to hear from you,” Santoro said. 
 
 We are stuck behind another #NJTransit train stuck inside the tunnel to Penn Station. pic.twitter.com/yZb1wm2kEf — Cameron Ridle (@CameronRidle) April 14, 2017 
 
 Riders waiting for the delays to clear took to Twitter to vent their frustration at NJ Transit. 
 
 “This is unbelievable. It should not have taken this long. Disgraceful,” wrote Neil Gallagher, in his first tweet since 2015. 
 
 “I've been stuck for an hour and twenty minutes...maybe change your delay time?,” user @BeckyAnne120 wrote. 
 
 Trains in/out of New York are now subject to up to 45 min delays due to an Amtrak overhead power problem in one of the Hudson River Tunnels. — NJ TRANSIT (@NJTRANSIT) April 14, 2017 
 
 Another passenger complained that he and his fellow NJ Transit riders are in the dark about the delays. 
 
 “@NJTRANSIT question- we are stuck on this train underground and no one is communicating to us what is actually happening- why?” wrote @patrickJWB. 
 
 Inside Penn Station, it was commuting chaos as hundreds of NJ Transit commuters crammed into its section of Penn Station, with trains on standby. 
 
 This is unbelievable. It should not have taken this long. Disgraceful. — Neil Gallagher (@NGSquan79) April 14, 2017 
 
 Jessica Carson, 31, who needed to catch a 5:15 p.m. train to Livingston, N.J., for Shabbat dinner, wondered whether it was worth staying at Penn Station. 
 
 “I guess I'll hang for a bit before I call my father and ask if he would like to pay for an Uber,” she said, shrugging off the possibility of missing family dinner. “It's public transportation. It happens.” 
 
 Amtrak spokesman Mike Tolbert said that the agency’s engineering crews had to inspect the train before the train moved out of the south Hudson River tunnel. 
 
 Penn Station commuters have been getting shafted lately by unreliable service at the busy transit hub, owned and maintained by Amtrak. 
 
 There were two train derailments in less than two weeks that caused days of limited service on NJ Transit and Long Island Rail Road trains, as Amtrak crews scrambled to bring Penn Station back to normal. 
 
 Government officials in both states have ripped into Amtrak's management of Penn Station following back-to-back derailments of NJ Transit trains, which investigators believe were caused by problems with the tracks. 
 
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 With Denis Slattery
– An Amtrak train had to be evacuated outside Los Angeles Friday night due to a passenger with a gun, the Los Angeles Times reports. According to KABC, fellow passengers saw the armed man and alerted Amtrak personnel, who notified police. The man appeared to be intoxicated, on drugs, or having a mental health issue. The 187 passengers on board were evacuated at the station in Chatsworth, and the train was surrounded by officers from the Los Angeles Police Department, Los Angeles County Sheriff's Department, and Amtrak. The armed man barricaded himself in one of the train's cars, Good Morning America reports. He surrendered following an eight-hour standoff only after officers fired tear gas at him.