Police Halt, Search Metra Train

Metra BNSF Line trains have been halted this morning as police search the No. 1252 express. The train was stopped at the Lisle station at 8 a.m. and has been at a stand-still since as police have evacuated and searched passengers. A source told the Tribune that one passenger called police from a cellphone after overhearing another passenger mention he had a gun on him.

Update: It's now been confirmed by the Trib that a ticket agent at the Naperville Metra stop called 911 after a man asked her several suspicious security-related questions. As of now the train has been reboarded but there's no report from police if anyone was arrested.

Update II: As a commenter pointed out below, CBS 2 is now reporting that the man who caused all the ruckus in the first place appears to be a secret service agent and is fully cooperating with police.