Officials said the "person of interest" detained early Monday in connection with a string of more than 50 deliberately set fires has been arrested and is expected to be booked on arson charges later in the afternoon. 
 
 N o new arsons have been reported since the suspect was taken into custody, but police stressed that the investigation is ongoing. 
 
 The fires have caused $2 million in damage, authorities said. 
 
 MAP: Arson fires 
 
 At a news conference Monday, officials said the arson task force is sifting through about 100 clues in the case. 
 
 Los Angeles Police Chief Charlie Beck, interviewed at the Rose Parade by City News Service, said: "I feel very good that we've got the right guy. [The suspect] had the right stuff in his van, and we are very confident we found our man.'' 
 
 The suspect is a native of Germany who may have been in dispute with federal immigration officials, sources said. 
 
 PHOTOS: Arson fires 
 
 The man appears to have been battling the U.S. government over the immigration status of a relative, but the officials said they don't know if this played any role in the arson case. The Los Angeles Police Department is in communication with federal immigration officials concerning the dispute, the law enforcement sources said. 
 
 LAPD detectives found materials inside the man's minivan that could have been used to set fires, the sources said. 
 
 All the sources spoke on the condition of anonymity because the case is ongoing. 
 
 FULL COVERAGE: Arson fires 
 
 Little is known about the suspect. Sources said the minivan had Canadian license plates but that detectives say the man is from Germany. 
 
 The man was detained near a drugstore at the corner of Fairfax Avenue and Sunset Boulevard early Monday morning, according to a witness to the incident. 
 
 Several sources said the man is believed to be the same person seen in a surveillance video released by police Sunday, when authorities pointed to the individual as a "person of interest" in the case. ||||| A Northridge, Calif., home improvement store was evacuated tonight because of a possible sighting of suspected cop-killer Christopher Dorner, just hours after police announced a $1 million reward for information leading to his arrest. 
 
 As helicopters hovered overhead and a command center was established, police searched the Lowe's store and eventually told shoppers they could leave, but could not take their cars out of the parking lot. 
 
 LAPD spokesman Gus Villanueva said the major response to the possible sighting was a precaution, but couldn't say whether Dorner was in the area. 
 
 The announcement of the $1 million reward today came as authorities in Big Bear, Calif., scaled back their search for Dorner, the disgruntled ex-cop who is suspected in three revenge killings. 
 
 "This is the largest local reward ever offered, to our knowledge," Los Angeles Police Chief Charlie Beck said at a news conference today. "This is an act of domestic terrorism. This is a man who has targeted those that we entrust to protect the public. His actions cannot go unanswered." 
 
 The money for the reward was pooled by businesses, government, local law enforcement leaders and individual donors, Beck said. 
 
 PHOTOS: Former LAPD Officer Suspected in Shootings 
 
 The reward comes on the fourth day of a manhunt for Dorner, who has left Southern California on edge after he allegedly went on a killing spree last week to avenge his firing from the police force. Dorner outlined his grievances in a 6,000 word so-called "manifesto" and said he will keep killing until the truth is known about his case. 
 
 Dorner's threats have prompted the LAPD to provide more than 50 law enforcement families with security and surveillance detail, Beck said. 
 
 Authorities are chasing leads, however they declined to say where in order to not impede the investigation. 
 
 Dorner's burned-out truck was found Thursday near Big Bear Lake, a popular skiing destination located 80 miles northeast of Los Angeles. 
 
 Investigators found two AR-15 assault rifles in the burned-out truck Dorner abandoned, sources told ABC News. 
 
 The truck had a broken axle, which may be the reason he decided to set fire to it, the police sources said. 
 
 Full Coverage: Christopher Jordan Dorner 
 
 Officers have spent the past couple of days going door-to-door and searching vacant cabins. The manhunt was scaled back to 25 officers and one helicopter in the resort town today, according to the San Bernadino Sheriff's Office. 
 
 On Saturday, Beck announced he would reopen the investigation into Dorner's firing but said the decision was not made to "appease" the fugitive ex-cop. 
 
 "I feel we need to also publicly address Dorner's allegations regarding his termination of employment, and to do so I have directed our Professionals Standards Bureau and my Special Assistant for Constitutional Policing to completely review the Dorner complaint of 2007; To include a re-examination of all evidence and a re-interview of witnesses," Beck said. "We will also investigate any allegations made in his manifesto which were not included in his original complaint." 
 
 Dorner is suspected of killing Monica Quan and her fiancé Keith Lawrence last Sunday in their car in the parking lot of their Irvine, Calif., condominium complex. Both were struck with multiple gunshot wounds. 
 
 Quan's father, Randal Quan, was a retired captain with the LAPD and attorney who represented Dorner before a police review board that led to Dorner's dismissal from the force in 2008. 
 
 On Wednesday, after Dorner was identified as a suspect in the double murder, police believe he ambushed two Riverside police officers, killing one and wounding the other. 
 
 The next day, Randal Quan reported he received a taunting call from a man claiming to be Dorner who told him that he "should have done a better job of protecting his daughter," according to court documents documents. 
 
 Anyone with information leading to the arrest of Christopher Dorner is asked to call the LAPD task force at 213-486-6860. 
 
 ABC News' Dean Schabner, Jack Date, Pierre Thomas, Jason Ryan and Clayton Sandell and The Associated Press contributed to this report.
– The "person of interest" detained earlier today in Los Angeles' string of arsons has been arrested, reports the Los Angeles Times. "I feel very good that we've got the right guy," says LA Police Chief Charlie Beck. He "had the right stuff in his van, and we are very confident we found our man.'' Indeed, there have been no new fires since the suspect was detained. Police say that the suspect is a German who was embroiled in a fight with federal immigration authorities. Meanwhile, sources tell the Times that they spotted the suspect in the back of a police cruiser, and a number of them flipped him the bird—a gesture he returned with an eerie smile. "It was creepy," says a music producer who witnessed the exchange. Click for more on the case.