Metra's BNSF line was at a standstill Tuesday morning in Chicago after a freight train was robbed, with  extensive delays  expected, Metra said.

The transit agency said BNSF trains were stopped just before 9 a.m. at Western Avenue due to the incident and police activity. An alert posted to Metra's website said inbound and outbound trains were on the move, but that some would be  extensively delayed. 

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Passengers were safe, and the Chicago Police Department was investigating, Metra said.

No further details were provided. NBC Chicago has reached out to CPD for more information.

This is a developing news story that will be updated as more information becomes available.
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