Police are looking for a man they say caused a bomb scare on the L train. 

They say the man seen above counted down from 5 and then yelled out "bomb" on a Manhattan-bound train that was leaving the Bedford Avenue station in Brooklyn.

It happened 5:45 p.m. Saturday, just hours before the explosion in Chelsea.

A passenger took a picture of the man with her cellphone before getting off the train. 

Anyone with information on the case should contact the Crime Stoppers hotline at 1-800-577-TIPS, or text CRIMES and then enter TIP577, or visit www.nypdcrimestoppers.com.