At least two shooters opened fire before dawn Sunday in Sacramento in the city’s second mass shooting in five weeks, killing six people and wounding 12 others as bars closed for the night and crowds emptied onto downtown streets, police said.

Three men and three women were killed in the violence. Their bodies remained on the pavement hours after the gunfire erupted, creating a massive crime scene that stretched across multiple city blocks. The shooters were still at large more than 14 hours later and at least four of their victims battled life-threatening bullet wounds in nearby hospitals.

As investigators poured through hundreds of pieces of evidence — much of it documented on the streets with blue and yellow markers — officials begged people to come forward with tips and videos that would help them to solve the crime.

“We’re asking for the public’s help in helping us to identify the suspects in this,” Sacramento Police Chief Kathy Lester said.

Authorities found a stolen handgun at the scene and a police camera captured part of the melee, while video footage posted to social media showed what appeared to be an altercation before the gunfire broke out in the city of about 525,000, located 75 miles (120 kilometers) from San Francisco.

Detectives were trying to determine the sequence of events before the shooting. Sgt. Zach Eaton, a police spokesperson, said they “don’t know if that fight actually lead to the shooting.”

Kelsey Schar was staying on the fourth floor of Citizen Hotel when she said she heard gunshots and saw flashes in the dark. She walked to the window and “saw a guy running and just shooting,” Schar told The Associated Press.

Her friend, Madalyn Woodard, said she saw a crowd in the street scatter amid the gunfire and a girl who appeared to have been shot in the arm laying on the ground. Security guards from a nearby nightclub rushed to help the girl with what looked like napkins to try to stanch the bleeding.

A video posted on Twitter showed people running through the street amid the sounds of rapid gunfire in an area on the outskirts of the city’s main entertainment district that is packed with restaurants and bars. Nightclubs close at 2 a.m. and it’s typical for streets to be full of people at that hour.

The district is anchored by the Golden One Center that attracts big-name concerts and is home to the NBA’s Sacramento Kings, who are hosting a game Sunday night against the Golden State Warriors. City officials have invested heavily in the area to promote development in the area and police said there would be extra patrols downtown ahead of the basketball game.

“This morning our city has a broken heart,” Sacramento Mayor Darrell Steinberg said. “We don’t know all the facts but we know there were mass casualties in a very short amount of time.”

Officers were patrolling the area near the shooting site two blocks from the State Capitol at about 2 a.m. when they heard gunfire and rushed to the scene, Lester told reporters. They found a large crowd gathered and six people dead in the street. Twelve others were also shot and wounded in the melee.

Pop duo Aly & AJ performed Saturday at Sacramento’s Crest Theatre and their tour bus was caught in the gunfire, the musicians said on Twitter. No one in their touring group was hurt, the tweet said.

Sunday’s violence was the third time in the U.S. this year that at least six people have been killed in a mass shooting, according to a database compiled by The Associated Press, USA Today and Northeastern University. And it was the second mass shooting in Sacramento in the last five weeks.

On Feb. 28, a father killed his three daughters, a chaperone and himself in a church during a weekly supervised visitation. David Mora, 39, was armed with a homemade semiautomatic rifle-style weapon, even though he was under a restraining order that prohibited him from possessing a firearm.

Councilmember Katie Valenzuela, who represents the area where Sunday’s shooting happened, said she’s fielded phone calls reporting many violent incidents in her district during her 15 months in office.

Valenzuela cried at a news conference as she told reporters that the latest phone call woke her up at 2:30 a.m. Sunday with details about the latest tragedy.

“I’m heartbroken and I’m outraged,” she said. “Our community deserves better than this.”

The city’s downtown development effort was working until the pandemic hit and forced many businesses to close, according to Grant Gorman, a bartender who lives near the place the shooting happened.

“Just when we were reaching some semblance of it being a bustling downtown area that was safe and we had a bunch of open businesses to go to, the pandemic hit it and just crushed it,” Gorman said.

Steinberg, the mayor, said in recent years it “has been a very difficult time in downtown Sacramento and Sacramento as a whole.”

He added that the shooting “gives pause to our entire community” but urged people to continue visiting the area despite the recent violence.

California Gov. Gavin Newsom said in a statement that his administration was working closely with law enforcement officials.

“What we do know at this point is that another mass casualty shooting has occurred, leaving families with lost loved ones, multiple individuals injured and a community in grief,” he said.

Kay Harris, 32, told AP she was asleep when one of her family members called to say they thought her brother Sergio Harris had been killed. She said she thought he had been at the London nightclub, which is near the shooting.

“Very much so a senseless, violent act,” she said.

Pamela Harris, Sergio Harris’ mother, told The Sacramento Bee the family had not heard from him yet.

“We just want to know what happened to him,” Pamela Harris told the newspaper. “Not knowing anything is just hard to face.”

Berry Accius, a community activist, said he came to the scene shortly after the shooting happened.

“The first thing I saw was like victims. I saw a young girl with a whole bunch of blood in her body, a girl taking off glass from her, a young girl screaming saying, ‘They killed my sister.’ A mother running up, ‘Where’s my son, has my son been shot?’“ he said.