EL MONTE - Officials found and removed a large graffiti message cursing the Los Angeles Police Department, which they believe to have been inspired by the recent manhunt for former LAPD officer Christopher Dorner, authorities said.

The spray-painted graffiti was first reported about 10:30 a.m. on a wall surrounding a home in the 4800 block of Dyson Street, at Lower Azusa Road, El Monte police Cpl. Aram Choe said.

"The graffiti was approximately three feet tall, and it was critical of the Los Angeles Police Department," the corporal said. He estimated the message was about 6 feet wide.

It read, "(expletive) LAPD," officials said.

Investigators suspected the graffiti was scrawled by a "Dorner supporter" in response to the recent manhunt, and ultimate killing, of quadruple-murder suspect and ex-LAPD officer Christopher Dorner, Choe said.

Dorner wrote in an online manifesto that he was engaging in a war against his former colleagues in law enforcement in retaliation for his termination from the LAPD in early 2009.

Before he was ultimately tracked to a cabin near Big Bear, where his body was found following a lengthy gun battle and massive fire, Dorner killed Cal State University Fullerton assistant basketball coach Monica Quan, 28, and her 27-year-old fiancee, Keith Lawrence, near their Irvine home, authorities said.

In the 10 days that followed, he went on to fatally shoot a Riverside police officer and a San Bernardino County sheriff's deputy as law enforcement agencies throughout Southern California mobilized to hunt for Dorner, officials said. Another Riverside police officer and another San Bernardino County sheriff's deputy were seriously wounded by Dorner's gunfire.