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UPDATE: Sacramento Police Say at Least 5 Gunmen Involved in Gang-Related Mass Shooting

SACRAMENTO (CBS SF) -- Police in Sacramento released additional info Wednesday on their investigation into Sunday morning's horrific mass shooting, announcing the number of shooting suspects has risen to at least five and that the incident appears to be gang related.

In a release issued late Wednesday morning, the Sacramento Police Department said detectives were continuing to piece together details regarding the April 3 mass casualty incident that injured 18 victims, including six fatally.

"Evidence in the case indicates that at least five shooters fired guns during the shooting, and that an exchange of gunfire took place between at least two groups of men," the release stated.

While three people have been arrested in connection with the shooting -- brothers Smiley Martin and Dandrae Martin as well as Daviyonne Dawson -- so far the arrests have been described by authorities as related to the Sunday morning shooting with none of the suspects in custody facing homicide charges.

The Martin brothers were among those wounded when gunfire erupted about a block from the state Capitol at about 2 a.m. Sunday as bars closed and patrons filled the streets. More than 100 shots were fired as hundreds of people scrambled for safety. Investigators were trying to determine if a street fight outside a nightclub may have sparked the shooting.

Police noted that as detectives continue to identify shooters and weapons involved in the deadly Sunday morning incident, the number of identified shooters may grow to more than five.

Police also said there are more indications "that gang violence is at the center of this tragedy."

Authorities said they were unable to elaborate on exactly what the gang affiliation of the individuals involved might be as of Wednesday, gangs and gang violence are inseparable from the events that drove these shootings.

"This tragedy downtown is a very public example of what families in many of our neighborhoods know too well," Sacramento Police Chief Kathy Lester said in the release. "The suffering inflicted by gang violence does not limit itself to gang members. It spills over to claim and shatter innocent lives and harm our entire community."

Earlier Wednesday, Sacramento Mayor Darrell Steinberg and other local officials held a press conference where they called for immediate and substantial investments in crime prevention and healing services for crime victims

Steinberg said the criminal justice system is broken and called for increased investments in crime intervention and transitional care for people who leave jail.

"This is a systems problem," said Steinberg.

Community leaders also called for investments in addressing trauma and community-based public safety.

"We are coming together to call for a real infrastructure that addresses the needs of prevention at a local level," said Executive Director of Californians for Safety and Justice Tinisch Hollins.

Video that was streamed on social media about four hours before Sunday's massacre appeared to show the two Martin brothers with shooting victim Joshua Hoye. You can hear the group talking about going to a club and Smiley Martin appears to be holding a gun.

Family members of Hoye confirm he was seen in the video. The violence that unfolded had leaders demanding change Wednesday morning.

"Just think; if we gave services to people who commit these crimes before they commit them, then we would not be here today with six families who are planning funerals," said San Joaquin County District Attorney Tori Salazar.

Police say they continue to receive a steady flow of information from the public on the deadly shooting. As of Wednesday, nearly 200 videos, photographs and other pieces of evidence have been submitted and are being analyzed.

The information is coming through our community evidence portal utilizing a QR code embedded in department websites and social media, and shared by news media.

Sacramento police are encouraging any witnesses with information regarding the investigation to contact the dispatch center at (916) 808-5471 or Sacramento Valley Crime Stoppers at (916) 443-HELP (4357). Callers can remain anonymous and may be eligible for a reward up to $1,000. Anonymous tips can also be submitted using the free "P3 Tips" smartphone app.

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