Dandre Martin, 26, who was taken into custody on Sunday as a “related suspect” in Sacramento. Reuters

A 27-year-old man who was seriously wounded in a shooting in Sacramento over the weekend that left six people dead was arrested on Tuesday for illegal possession of a firearm and possession of a machine gun.

Smiley Martin, 27, was arrested on Tuesday on suspicion of possession of a firearm by a prohibited person and possession of a machine gun. Hours before Sunday’s attack, Martin had posted a live Facebook video of himself brandishing a handgun.

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A law enforcement official told media that police in California's capital city took Martin into custody at a local hospital.

Martin is the brother of Dandre Martin, 26, who was taken into custody on Sunday as a "related suspect" in the case, police said. Dandre Martin was booked on suspicion of assault and illegal possession of a firearm.

A police vehicle is seen after an early-morning shooting in Sacramento, California.  Reuters

Police did not elaborate on the men's alleged roles in the shooting and it was not clear if additional suspects remained at large. Police Chief Kathy Lester has said that "multiple" shooters were involved in the massacre that killed six people and injured 12 others.

A third man, 31-year-old Daviyonne Dawson, was taken into custody on Monday on suspicion of being a felon in possession of firearm, police said, but he was not accused of being involved in the mass shooting.

The gunfire erupted at about 2am local time (0900 GMT) on Sunday near the Golden 1 Center, home of the National Basketball Association's Sacramento Kings.

Police believe the shooting followed an altercation at a nearby nightclub and asked for the public's help in obtaining videos of that incident that had been posted on social media.

Investigators said they found more than 100 spent shell casings at the scene and a stolen handgun that was found to have been converted to a weapon capable of automatic gunfire.

Of the 12 victims who survived, police said they were "suffering from gunshot wounds ranging from minor to critical but stable."

The violence took place in an area recently revitalized as an entertainment center and just hours after rapper Tyler the Creator had performed at the Golden 1 Center on Saturday night.