Crash on Richmond-San Rafael Bridge blocks westbound lanes

A crash on the Richmond-San Rafael Bridge blocked both westbound lanes during Thursday morning's commute.

At least two vehicles appeared to be involved, as seen on a Caltrans traffic camera.

Traffic was backed up to Harbor Way in Richmond as of 8:30 a.m. By 9 a.m., the lanes had been reopened but residual delays remained for westbound traffic.

There was no immediate word on what caused the crash.