Update at 4:47 p.m: This is the latest service advisory from the BART website:

BART is recovering from an earlier problem. There is a 15-minute delay between system wide due to a medical emergency.

BART has not updated its Twitter messages in over an hour. We have a call into media relations.

Man Hit by BART Train Causing Systemwide Delay 10 August,2012Laird Harrison

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