The SFPD is urging drivers to avoid Fourth and Townsend streets, following a collision that appears to have injured a pedestrian.

Traffic Alert: Vehicle Collision 4th St/Townsend, Street Closures. Avoid the Area if Possible. #SFPD @sfmta_muni #SF #SOMA pic.twitter.com/AUE7tV758M

— San Francisco Police (@SFPD) September 26, 2016

According to a witness who tweeted from the scene, a woman was hit by the driver of a Toyota Prius and is stuck in the vehicle's wheel well.

Absolutely horrific. Car ran over woman. She's stuck in his wheel well. 4th and Townsend. pic.twitter.com/sZ2k7sFiMX

— winejerk (@WineJerk) September 26, 2016

More details to come as we learn more.

Update, 11:02am: The pedestrian is on her way to the hospital, and the intersection has been reopened, according to SFPD. The condition of the pedestrian remains unclear.