Anaheim Officers Search for Armed Man After Stolen Vehicle Rams Undercover Police Car; 5 People Detained

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An armed man who assaulted an officer and fled from a stolen car was the subject of an unsuccessful search in an Anaheim riverbed Thursday afternoon, police said.

The driver of a vehicle that had been identified as stolen out of Fresno struck an undercover officer's car and then tried to hit a black-and-white patrol vehicle, Anaheim Police Department officials said on scene. No officers were injured.

The driver ran from the vehicle into the Santa Ana riverbed east of Imperial Highway, near the 5700 block of La Palma Avenue, prompting a search involving dogs and a helicopter.

The man was described as Hispanic, in his 20s, "skinny" and last seen wearing a red T-shirt. Wyatt said he entered a tunnel in the concrete river channel.

"Will be wet from crossing riverbed," the Police Department tweeted.

The man being sought was believed to be armed and dangerous, police Sgt. Daron Wyatt said.

The search concluded unsuccessfully about 4 p.m. Police asked people who think they see the man to call 911.

Four females and a male from the stolen vehicle were detained, and a loaded handgun was found underneath the vehicle, Wyatt said.

Police tweeted an image of an apparent Chrysler minivan or SUV that had collided with a patrol vehicle and another car.

The public had been urged to avoid the area, and a biking and walking path next to the river was closed.

KTLA's Jennifer Thang contributed to this article.