Authorities identify 'person of interest' in park ranger's shooting Authorities have identified Benjamin Colton Barnes as "person of interest" They say he is also wanted in connection with a shooting at a party Helicopters equipped with infrared cameras are being used in search, authorities say The slain ranger is a 34-year-old mother of two (CNN) -- A massive manhunt was under way early Monday for a man wanted for questioning in the New Year's Day shooting death of a park ranger at Washington's Mount Rainier National Park. Federal and local authorities described Benjamin Colton Barnes, 24, as a "person of interest" in the shooting of park ranger Margaret Anderson. He is heavily armed and wearing body armor, authorities said. "This is probably somebody who is experienced with the outdoors," Pierce County Sheriff Ed Troyer told CNN affiliates KOMO and KIRO of Seattle. Barnes is also wanted in connection with a shooting Sunday in the Seattle suburb of Skyway that left four people wounded, the affiliates reported, citing the King County Sheriff's Department. The park shooting began with "a normal traffic stop" around 10:30 a.m. ET), Mount Rainier National Park spokeswoman Lee Taylor told CNN. Anderson, 34, responded to that call and set up her patrol vehicle as a roadblock. When the gunman arrived at the roadblock, he got out of his car and shot her, Taylor said. Anderson managed to call for help, alerting Pierce County Sheriff's deputies that she had been shot, Troyer said. Deputies "tried to get to her, and they were fired upon," Troyer said. They managed to get a small team together to get to her, and get her out of the line of fire. Medic checked her and, unfortunately, she was dead. The suspect then ran into the spacious national park, whose border is about 50 miles southeast of Seattle, authorities said. Investigators found evidence of weapons and body armor in the suspect's car, Troyer said. Authorities used helicopters equipped with infrared cameras late Sunday and early Monday to try to track the gunman in the park, KOMO reported. More than 150 law enforcement officers were involved in the search, authorities said. The park was locked down after the shooting. Taylor said authorities evacuated "most of the people ... safely," with more than 100 people "holed up in our primary visitor center" with food, water and five law enforcement officers standing guard. "We don't want to try to have those people get to their vehicle and caravan down the park road where it could be dangerous, being sniped at by a gunman," Taylor said Sunday night. So for now, they are going to sit tight in the visitor center. Between 4 to 5 feet of snow is on the ground. "There's a lot of snow on the ground, (and) it would be difficult to move through quickly," Taylor said. And it's heavily forested. Anderson was the mother of a 4-year-old and 1-year-old, and the wife of a fellow park ranger, according to Taylor. A ranger at Mount Rainier for the past four years, Anderson "was on the job not for money or for glory, but out of a love for wild places and the national parks," Taylor said. "She was a person with a quick smile, a very gentle person, a very competent ranger," Taylor said. This gunman took the life of somebody who had a great deal to live for and was making great contributions to society by being a national park ranger.