BART trains were unable to start running early Friday morning after a computer equipment problem shut down the system, according to the transit agency.

“A computer equipment problem following network upgrade work is preventing the start of BART service this morning. Seek alternative means of transportation,” BART said in an advisory released shortly after 5 a.m.

The agency urged commuters to use the BART Trip Planner on bart.gov or the BART app to find transit alternatives by deselecting BART in “transit options.” It also directed passengers to a map of bus and ferry alternatives at bart.gov/transbayalts.

This is a developing story.

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