SAN FRANCISCO—Authorities have released more details about a standoff on San Francisco's Treasure Island that blocked access to the island for more than five hours Tuesday morning.

Police say the trouble began around 11 p.m. Monday when officers responded to a report of a man with a gun driving a stolen car in San Francisco's Lower Nob Hill neighborhood.

Police spokesman Sgt. Michael Andraychak says as officers pursued the car, the driver, identified as Duncan Phillips, fired at least one shot at police before crossing the San Francisco-Oakland Bay Bridge and driving onto Treasure Island.

Andraychak says the standoff came to an end around 5 a.m. Tuesday when the 29-year Phillips shot himself.

Phillips was pronounced him dead at the scene.

Besides the San Francisco incident, investigators say Phillips was also wanted in connection with a Nov. 22 armed robbery in Benicia.