A crash reportedly involving a motorcycle on Interstate 680 in Walnut Creek resulted in one fatality Monday night, according to the California Highway Patrol.
The collision was first reported at 9:49 p.m. on northbound 680, near the Ygnacio Valley Road offramp, CHP officials said.
At 10:08 p.m., CHP officials called for a Sig-alert, closing the highway's northbound lanes at Olympic Boulevard. CHP officials estimate the highway should reopen by midnight.
Further information about the crash was not immediately available.