Sig-alert, Highway 91, Corona, 4:16 p.m.

A crash involving up to four cars is blocking the carpool lane on the eastbound 91, east of Promenade Avenue. One vehicle is reported overturned. An ambulance is responding.

** UPDATE **
4:36 p.m. Carpool lanes blocked on the eastbound and westbound sides of the 91. All other lanes on both sides are open.