Los Angeles - Los Angeles police arrested a man on Sunday on suspicion of intentionally driving into a crowd at a boardwalk popular with tourists, killing an Italian woman and injuring 11 others.
Nathan Campbell, 38, was booked for investigation of murder and remains jailed on $1m bail, police said.
He turned himself in about two hours after the incident that occurred at around 18:00 on Saturday at the Venice Beach boardwalk, a cultural hub in a part of Los Angeles known for its circus-meets-gritty-city eccentricities.
Investigators don't yet have a motive.
Security video shows a man parking his black car alongside the seaside boardwalk as the sun sank, surveying the idyllic scene for several minutes before getting back into the car and speeding into the crowd.
It shows hundreds of people walking lazily or sitting at cafes before the black car suddenly appears and sends them scrambling wildly.