Police in Glendale, Arizona, said three people are dead and five injured after a shooting at a restaurant Sunday night. No one has been arrested, but investigators believe multiple shooters were involved.

NBC affiliate KPNX of Phoenix reported that the restaurant El Camarón Gigante was holding a Cinco de Mayo party at the time.

At least three people were killed and five people were wounded in a shooting that erupted on Sunday at a restaurant in Arizona where a crowd of people was celebrating Cinco de Mayo, the police and a witness said.