PHILADELPHIA (AP) -- The FBI has now joined the search for a college senior who was last seen leaving a crowded Philadelphia bar after a night out with friends.

Shane Montgomery
Shane Montgomery (Philadelphia Police)
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On Sunday afternoon, police combed the frigid waters of the Manayunk Canal but came up empty in their search for 21-year-old West Chester University student Shane Montgomery.

Montgomery's parents watched from the canal bank.

Police say Montgomery was home from school and had met up with friends Wednesday night. Authorities say he became separated from them and was escorted out by a bouncer at 2 a.m. Thursday after stumbling. He hasn't been seen since.

An FBI spokesperson tells WCAU-TV that their taskforce is often involved in missing-person's cases where the person disappears under "suspicious circumstances."

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