03/24/2014 12:30 am ET Updated Mar 24, 2014

San Francisco Shooting: Gunman Opens Fire In Tenderloin Neighborhood, Wounding At Least 7

Seven people were wounded in a shooting Sunday night in San Francisco's Tenderloin district.

KRON 4 says the incident may have been a drive-by shooting, while KTVU's Christien Kafton tweeted that police are still looking for the shooter.

One witness told ABC 7's Lilian Kim that he heard at least 18 shots.

Others also reported on Twitter that they heard the shots:

All of the injured were taken to San Francisco General Hospital and are expected to survive.