8:32 PM: BART service through the Transbay Tube was restored around 8:15 p.m. after a man who walked into the tunnel was detained, BART officials said this evening.
The man was spotted walking into the tube around 6:46 p.m. by a surveillance camera, BART spokesman Jim Allison said.
BART service in the tube was shut down, causing major delays, while BART police entered the tube to conduct a search.
The man was detained at 7:44 p.m. and is in custody, Allison said.
7:27 PM: BART is reporting major delays on all transbay routes because a person has been reported walking through the Transbay Tube area, according to a dispatcher.
Trains are unable to move through the tunnel until the report is investigated, the dispatcher said.