Neighbors who live near the 33400 block of 11th Street dialed 911 about 1 a.m. after they heard gunshots and found the victims -- both residents of the Decoto neighborhood in Union City -- lying in the street with gunshot wounds.

Court records show one of the victims was shot twice in the face at close range and the other was shot in the back of the head as he attempted to flee.

A motive has not been made public, but according to a probable cause affidavit by Union City police Officer James Cordero, Redding told police that he, Estrada and three juvenile gang members were smoking marijuana at a park when they saw the victims.

Estrada, who has two felony prior convictions for assault and vandalism, began speaking with one of the victims and "convinced the victims to come with them and get some beers," according to Redding's statement to police.

But Redding told police that Estrada really believed that one of the victims was a rival gang member, the affidavit states. The document adds that Redding said Estrada then confronted one of the victims, asked if he was a rival gang member and then shot the victims. Redding also told police he gave Estrada a .357 revolver just one minute before the fatal shooting.

But when police interviewed Estrada they told him they found a cigarette at the crime scene with his DNA on it. Court papers say he "became even visibly more nervous and his stomach began heaving and out." He then told detectives he was present for the murder but that Redding was the shooter.

Prosecutors also charged Estrada and Redding with the special circumstance of committing multiple murders. In addition, they are accused of committing the murders to benefit a criminal street gang and Redding is charged with carrying a concealed dagger.

Union City police said the men were taken into custody during raids in locations in Union City and Hayward on Aug. 29. Several juveniles considered persons of interest in the case were also detained by police but later released. Horner did not say how old the juveniles were or where they were from but did say additional arrests may be made as investigators "assess the seriousness of the crime, the strength of the forensic evidence, and the backgrounds of any additional involved parties."

Police made the arrests with the help from the Hayward police SWAT team and other local law enforcement.

The slayings were the only killings this year in Union City aside from Sunday's officer-involved shooting, when police shot and killed 46-year-old Vergel Ricafrente Worrell after they say he pointed a gun at officers. It happened in a quiet neighborhood in the 32600 block of Kenita Way sometime after 2:30 p.m. Before the shooting, police say he randomly fired a gun into the air 10 to 15 times in the middle of the afternoon. That shooting remained under investigation on Thursday.

Anyone with information about any of the killings are asked to call police at 510-675-5224.

Contact Natalie Neysa Alund at 510-293-2469. Follow her at Twitter.com/nataliealund.