CONCORD -- A suspected carjacker trying to elude capture from police in one vehicle collided with another one before escaping Tuesday afternoon, police said.

The pursuit began around 11:18 a.m. with a Contra Costa Sheriff's deputy trailing a vehicle later determined to be stolen, Concord police Lt. Robin Heinemann said. Concord police did not say why the pursuit began, but several police sources said the chase was tied into a carjacking.

The male suspect then collided with a white Nissan SUV on Concord Boulevard near West Street, before escaping toward Concord High School, Heinemann said. The man tried to steal another vehicle before fleeing on foot, she said.

The woman in the SUV and the three children in the car with her were uninjured, according to a neighbor of the driver.

Concord High School went into a police-ordered lockdown at 11:30 a.m., while administrators at nearby El Dorado Middle School chose to lock that school down as well, Heinemann said.

Police searched the area for more than two hours but were unable to find the man. He was described a Hispanic or medium-skinned male, heavyset and weighing about 200 pounds, Heinemann said. He had long dark hair and was wearing a black Oakland Raiders jersey.

The lockdowns on both campuses were lifted about noon, according to school employees.

Anyone with information about the case is asked to call the Concord Police Department's Investigations Division at 925-671-3030. Anonymous tips can be submitted to 925-603-5836.

Check back for more details.

Contact Rick Hurd at 925-945-4789 and follow him at Twitter.com/3rdERH.