Officers say they are now investigating two separate threatening calls after the security incident before a Hanz Zimmer concert that caused a massive backup on I-880 and the Oakland Coliseum BART foot bridge.

A bomb threat Thursday night forced a lockdown at the Oakland Arena during a concert, according to Oakland police.

An earlier version of this story misstated the day the incident occurred. We regret the error. (KRON) — The Hans Zimmer concert at Oakland Arena was delayed Thursday night due to a bomb threat, according to the Oakland Police Department.