It was not clear if the driver knew he was being followed by the undercover car, Sampson said. The undercover officers followed the pickup for five miles, stopping on a dead-end street in Fullerton about 10:50 p.m. But those who investigate street racing have said rallies were becoming more common, with drivers growing more aggressive toward police. The officers, part of a task force investigating street racing and other outlaw driving events over the holiday weekend, called for marked cruisers to break up the gathering. james.queally@latimes.comFollow @JamesQueallyLAT for more Southern California newsTimes staff writer Rosanna Xia contributed to this report.

Source: Los Angeles Times July 04, 2016 17:25 UTC