Police are searching for two assailants who sneaked into a backyard party in California on Sunday and opened fire while a small crowd watched football on television, killing four people and injuring six others.
Fresno Police Chief Andrew Hall said the house where a group of Hmong family and friends had gathered was deliberately targeted, but the shooters fired at random once they saw men in the backyard watching football.
Mr Hall said there was no immediate word on a motive and so far there was no indication that any of the victims knew their attackers.
The men who died were ages 21 to 40, he added.
Three were found dead when emergency crews arrived. A fourth person died at a hospital. Six others were hospitalised in critical condition but are expected to survive, authorities said.
Mr Hall said police were investigating whether the shooting was connected to a recent disturbance involving some of the people at the party.
He also announced the establishment of an Asian gang task force ahead of the Hmong New Year, out of concern about the possibility of more violence.