VANCOUVER - Vancouver police finished their work Saturday at the scene of Thursday's shooting rampage at a Chinese restaurant that killed two people and wounded six.

Investigators finished processing the crime scene and turned The Fortune Happiness restaurant back to its owners, said Vancouver Police Const. Howard Chow in an email.

Four of the six wounded in the shooting were still in hospital with non-life-threatening injuries Saturday, including one that was initially categorized as "critical,'' Chow said. Two others were released.

Two masked men burst into a restaurant before dawn Thursday, gunning down a table at the restaurant in an attack that police said bore all the hallmarks of a gang-related incident.

CTV reported there had been a fight at the same restaurant earlier in the week between an Asian group and an Indo-Canadian mob called the Independent Soldiers.

Police stressed Friday that part of the gang problem in Vancouver is connected to the illegal gun market coming from the United States.

The Vancouver shooting has sparked one of the largest police investigations in the city's history.

Vancouver police didn't have any information as to whether there was any connection between the shooting and a gun seizure in Abbotsford.

Abbotsford police said they have four suspected gang members in custody and seized several firearms after a search warrant was executed on two homes Friday.

One of the weapons, an AR-15, is similar to a gun used in the Vancouver shooting. Investigators are trying to determine if there's a link, but were cautious Saturday on whether there is any connection.

"It's too early to say if it's the same firearm,'' said Abbotsford Police Sgt. Elly Sawchuk.

She said the people in the first home, who are all related, are believed to members of a gang that calls itself the United Nations.

Two children from that residence were taken into custody by the Ministry of Children and Family.

Firearms that were seized in the search warrant included the AR-15, a .22-calibre Ruger rifle, a 9 mm handgun and a large amount of ammunition.

Abbotsford police say the United Nations gang deal primarily with weapons and drug trafficking and production. Officials first became aware of the group in 2002.

The gang, which has members from various different ethnic groups, started with a group of high school friends in the Chilliwack and Abbotsford area, police said. It currently has members and associates across the province and much of the country.