Updated 6:28 a.m.:
A fatal collision that killed a pedestrian on southbound Highway 680 at Stoneridge Drive at about 3:31 a.m. has caused traffic to be diverted from southbound I680 to westbound I580.
According to 511.org, a "Severe Traffic Alert" was issued at 4:55 a.m. for a collision.
Bay City News is reporting that the all of the southbound lanes of I680 have reopened.
According to the CHP website, the Sig Alert has been canceled.
Early this morning, the 511 site read, "All lanes are blocked by an accident. Traffic is being diverted off the freeway. Motorists are advised to expect delays and to use alternate routes. There is no estimated time of opening the roadway."
Patch will update this story as we get more information.
Bay City News Service contributed to this report.