No officers were injured. One suspect received minor injuries and was treated at Stanford Hospital and released, said police spokesperson Nicole Acker.
Four people were booked into San Mateo County jail for parole violations. They are Fredrick Tippons, 31; Luis Mariscal, 26; Raymond Bradford, 25, all of East Palo Alto, and Breen Hawkins, 19, of San Mateo.
Edward Lewis, 30, of East Palo Alto was booked for possession of a firearm and possession of a controlled substance.
In addition to a gun that was recovered immediately, four more weapons — two handguns and two rifles — were found in a subsequent search of the crime scene, police said.
The incident began when police received a call at 1:16 a.m. Sunday, Dec. 18, that several people were in front of the house in the 1100 block of Hollyburne Avenue, including a man with a gun.
When police arrived, they found five to six people who matched the descriptions provided by the caller. Shots were fired at the officers, one officer returned fire, and the people fled, Ms. Acker said.
Two people were immediately arrested, and a gun was recovered.
Officers set up a perimeter and called for backup. SWAT teams from Menlo Park, Redwood City and San Mateo County responded, as did the California Highway Patrol. They helped conduct yard searches, and four more suspects were arrested.
Police ask that any witnesses call the police department at (650) 330-6300 or the anonymous tip line at (650) 330-6395.