Quote:Los Angeles authorities are offering a $1 million reward for information leading to the arrest of a fugitive ex-cop wanted in the murders of three people, as the latest investigation into a possible sighting of the suspect yielded no clues.

Police evacuated a Los Angeles home improvement store Sunday evening after a caller said they had seen someone resembling 33-year-old Christopher Dorner.

Authorities searched for hours but found no evidence that Dorner was there or had been there, Los Angeles police spokesman Gus Villanueva said.

Several tips came in a few hours after Los Angeles Mayor Antonio Villaraigosa announced the reward at a news conference alongside police chiefs and mayors from Irvine and Riverside.

“This search is not a matter of if, but a matter of when," he said. "I want Chris Dorner to know that.”