Sheriff's deputies and police officers searching for murder suspect Christopher Jordan Dorner have suspended their ground search of the Bear Valley area until morning.

The San Bernardino County Sheriff's department announced elevated patrol operations will be in effect throughout the Bear Valley area overnight. Area residents are advised to call 911 if they see any suspicious activity and to only open their doors to persons who are known to them or to uniformed law enforcement officers.

Law enforcement agencies have been searching the Bear Valley area since Thursday, when a Nissan Titan pickup truck believed to belong to Dorner was found on fire in the Bear Mountain ski resort parking lot. Dorner is suspected of killing an Irvine couple, Monica Quan and Keith Lawrence, on Sunday and a Riverside police officer early Thursday morning.

Dorner is a fired Los Angeles Police Department officer and is believed to be motivated by revenge for his 2008 firing from the department. Dorner's online manifesto claims he was fired in retaliation for reporting another officer's abusive use of force and declares he will commit "horrendous murders" to change the department.

Dorner is also a Navy veteran and has rifle and pistol training. He is believed to be armed and dangerous.

Searchers are scheduled to resume their efforts to find Dorner around 7 a.m. Saturday. Deputies plan to use armored personnel carriers and snowcats to search the forests around Bear Valley.