A gruesome discovery briefly shut down a commuter train station in Berkeley, California, on Monday.

At about 3 a.m., BART workers found a severed human foot on the train tracks. It's believed the foot had been there for more than three weeks, and belonged to a woman who was struck by a train on Dec. 20 .

The woman, who was not named, survived but lost part of her right leg , the San Francisco Chronicle reported.

"This was a right foot ," BART spokesman Jim Allison told the Los Angeles Times. "All signs point to the fact that this is probably the same foot."

The station was closed for about 20 minutes, and reopened in time for the morning commute once investigators determined there was no foul play , KTVU reported.

Allison told Bay City News that the discovery was "an unusual start to the workweek ."

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