The alleged shooter, James Brooks, 19, was arrested yesterday in Las Vegas, the FBI said in a statement.
Authorities launched a manhunt for Brooks, who, with an accomplice, allegedly opened fire on the LA police officers in their patrol car Sunday, said officials, who added that no one was injured.
The other suspect was detained shortly after the incident, authorities said.
Law enforcement across the United States has been on alert after the fatal shootings of the two officers in New York earlier this month.
The two officers were slain following nationwide demonstrations over the killing of several black suspects by police, amid historically bad relations between US law enforcement and the African American community.
