News:Mass Shooting Kills 4

SAN FRANCISCO (CBS SF) -- Four people have been killed in a mass shooting at a nightclub in San Francisco's Tenderloin district late Thursday evening. Two are in critical condition but expected to survive, a police officer said.

Among the two critically wounded is are woman in her 20s and a man in his 30s, both shot around 10:20 PM along with several other victims at the Adapter nightclub on Eddy street, next to Hotel Eddy.

SFPD has counted a total of 13 victims, some of which were shot indoors and others outside on the street. The remaining victims were treated for injuries that are not believed to be life-threatening, while the two aforementioned remain hospitalized in "critical but stable condition," Officer Jin Choi said.

The officer said an argument that started out in a shoving match prompted the first round of gunfire inside the club.

More shots were fired just outside of the club and in a public parking lot on Eddy and Larkin.

He said investigators do not know what caused the fight.

"It's one of those incidents that happened too fast for witnesses to follow. Now we have four victims that are dead, and so many more hurt," the officer said.

Those among the dead were allegedly found with weapons on hand or nearby, suggesting that they were participants in the shooting. But two suspects fled the scene before officers arrived and had not been located. The suspect descriptions are a skinny Black man in a camouflage outfit and another Black man in a baseball cap with dreadlocs.

Police were reviewing surveillance footage from the club to see whether the cameras may have captured the shooting, Choi said.

Anyone with information about the crime is asked to call the San Francisco Police Department's anonymous tip line at (415) 575-4444.