[Dave Lane]

04:49 PM ET
Source: 2 deputies wounded in shootout with ex-LAPD officer
Law enforcement officers are checking reports that renegade ex-LAPD officer Christopher J. Dorner was sighted in Big Bear area of southern California
Authorities chasing pickup truck, San Bernardino Sheriff's Department says
Dorner, alleged to have said he's targeting police officers for his 2008 dismissal from LAPD, has been the subject of a seven-day manhunt as a suspect in three killings
CWe'll have updates below as we get them; full story here.
[Updated at 4:49 p.m. ET] Two sheriff's deputies have been wounded in a shootout with a suspect believed to be renegade ex-Los Angeles police officer Christopher Jordan Dorner, a high-ranking law official with knowledge of the investigation said Tuesday.

The source says the suspect, believed to be Dorner, shot the deputies as police responded to a report of a home invasion and a carjacking in the Big Bear area of southern California.

After police got a description of the vehicle, police set up a road block, and Dorner approached the officers, the source says. Dorner then opened fire, wounding the two sheriff's deputies, according to the source.

The official said Dorner was "pinned down."

[Updated at 4:35 p.m. ET] The San Bernardino Sheriff's Department confirms that authorities are chasing a pickup truck, according to CNN's Casey Wians.

The department hasn't confirmed whether Dorner is connected to the chase. It did say that Dorner wasn't in custody, CNN's Chris Welch reported.

[Posted at 4:31 p.m. ET] Law enforcement officers are responding to reports that ex-LAPD officer Christopher Jordan Dorner has been sighted and may have been involved in a robbery in the Big Bear area of southern California, said law enforcement sources involved in the investigation.