Police said the Sacramento mass shooting on Sunday has resulted in at least six people's death, while 12 others suffered "varying degrees of injuries."

In an afternoon news conference, Sacramento police chief Kathy Lester said police officers were patrolling the area at about 2 a.m. when they heard someone open fire.

Upon arriving at the scene, they found a crowd gathered on the street, NBC News reported. Authorities were not sure if there were more shooters involved in the Sacramento shooting in California.

Lester said the incident was a "very complex and complicated scene." Police later on said that a firearm had been recovered at the scene.

Sacramento Mayor Darrell Steinberg noted that there were "mass casualties in a very short period of time." Steinberg described the shooting as a "senseless and unacceptable tragedy."

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Sacramento Mass Shooting in California

The Sacramento police chief said on Sunday afternoon that authorities believe the deadly shooting resulted from a fight and that they were looking for multiple suspects, according to CBS News.

Police found a large crowd gathered, with three men and three women pronounced dead at the scene. Another 12 people were taken to hospitals or took themselves there. 

There was no information released about the conditions of the injured victims. Lester said all the victims were adults, with their identities being withheld due to pending notification of their families.

Steinberg pleaded for an end to gun violence not just in California's capital but throughout the whole country. The Sacramento mayor said it was a "sickness in our country" and in "our culture."

Authorities urged witnesses or anyone with recordings of the shooting to contact the police. Police had distributed a QR code for anyone to scan and submit a video from the scene.

Lester asked for the public's help in helping the police identify the suspects in the Sacramento shooting. A law enforcement source noted that authorities were investigating whether automatic weapons were involved.

They also had started studying downtown cameras and license plate readers for potential clues, according to Sacramento Bee. An information center was also set up at City Hall for relatives of the victims.

Sacramento Shooting

Sacramento Bee reported that it was Sacramento's second mass shooting in weeks. A man shot his three daughters and a fourth person to death at a church in suburban Sacramento before he killed himself.

The incident happened in late February. The man was identified as David Mora, who had a restraining order that prohibited him from having a gun. He fired a AR 15-style rifle in the incident.

The recent Sacramento shooting triggered a new wave of demands from gun-control activists around the country, including elected officials in California, for more response in stopping gun violence.

Relatives were trying to know whether their loved ones were involved in the shooting. Two men who were standing nearby at the scene said they were trying to know from police about a loved one feared dead or injured.

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This article is owned by Latin Post.

Written by: Mary Webber

WATCH: Police Rush In and Bystanders Flee After the Downtown Sacramento Mass Shooting - From Sacramento Bee