(CNN) -- [Updated at 6:46 p.m. ET] One of the two law enforcement officers hurt in today's shootout has died, CNN affiliates and the Los Angeles Times have reported. We're awaiting a news conference at the medical center.
[Updated at 6:42 p.m. ET] We're about to get an update on the two injured sheriff's deputies. A news conference is expected to begin shortly at California's Loma Linda University Medical Center.
[Updated at 6:19 p.m. ET] A reporter with CNN affiliate KCBS captured audio of gunfire during the encounter between police and the suspect. It's unclear which party was shooting during the audio recording, which runs for more than a minute.
[Updated at 6:19 p.m. ET] Aerial footage from KCAL and KCBS shows officers stopping and checking the interiors of vehicles on a road in the Big Bear area.
[Updated at 6:15 p.m. ET] LAPD Cmdr. Andrew Smith tells reporters that authorities aren't 100% sure that the suspect in the cabin is Dorner, but they believe it's him.
"The likelihood is that it is him, but we can't say for sure," Smith said.
Smith called on Dorner to surrender. "Everyone is very hopeful that this thing ends without further bloodshed," he said.
"If he's watching this, the message for (him) is enough is enough," Smith said. "It's time to turn yourself in. It's time to end the bloodshed."
Smith said authorities believe the suspect has access to TV. Smith asked television stations to not show live signals of the cabin area "because it puts our officers at a tactical disadvantage."
Earlier today, San Bernardino County Sheriff John McMahon has asked that news helicopters pull back or leave the area of the barricaded suspect. (See 5:36 p.m. entry.)
[Updated at 6:03 p.m. ET] The two deputies who were injured in this incident have been airlifted to Loma Linda Medical Center, a San Bernardino County sheriff's spokeswoman Jodi Miller says. No information on their conditions has been released.
Moments ago, LAPD Cmdr. Andrew Smith told reporters that the deputies were injured during the gunfire exchange between officers and the suspect at the cabin where the suspect barricaded himself. This squares with what a law enforcement source told CNN earlier.
Smith told reporters that LAPD officers are waiting for the San Bernardino County Sheriff's Department to give them authorization to assist in today's incident.
[Updated at 6 p.m. ET] We're expecting to hear from the Los Angeles Police Department soon. A news conference is expected to start in a few minutes.
[Updated at 5:36 p.m. ET] San Bernardino County Sheriff John McMahon has asked that news helicopters pull back or leave the area of the barricaded suspect.
"Gunfire is being exchanged between law enforcement and the suspect; your personnel are in danger and could contribute to officer safety on the ground," the San Bernardino Sheriff's Department said in a statement.
[Updated at 5:22 p.m. ET] Authorities are now saying that a man believed to be Dorner exchanged gunfire with law enforcement officers after he barricaded himself inside a cabin Tuesday afternoon, the San Bernardino Sheriff's Department says.
Here's the sequence of events from the sheriff's department: Officers got a report of a stolen vehicle in the Big Bear area, and deputies responded to the area at 12:22 p.m. PT and began looking for the vehicle on the ground and from the air.
"The vehicle was located at Hwy. 38 and Glass Rd. The suspect fled into the forest and barricaded himself inside a cabin," the sheriff's department said in a statement. "A short time later there was an exchange of gunfire between law enforcement and the suspect. Sheriff's SWAT is on scene."
Two law enforcement officers are being airlifted to a local hospital with "unknown injuries," the sheriff's department said. Earlier, a high-ranking law enforcement source told CNN that two sheriff's deputies were wounded in a shootout.
[Updated at 5:16 p.m. ET] Authorities have ignited a smoke grenade in the Big Bear area of California to mark a location for police helicopters, a high ranking law official with knowledge of the investigation said Tuesday.
[Updated at 5:15 p.m. ET] Former FBI Assistant Director Tom Fuentes explains to CNN what law enforcement personnel usually mean when they say someone is "pinned down":
"The term commonly means he's not running any more, that they've got him trapped in a home or some other physical location ... . That means he's contained; that doesn't mean he's in custody ... but it means he's not running loose."
Earlier, a high-ranking law enforcement source told CNN that authorities believe they have Dorner "pinned down" in California's Big Bear Lake area after a shootout in which two sheriff's deputies were wounded Tuesday.
[Updated at 5:34 p.m. ET] In posts at 5:06 p.m. ET and 5:09 p.m. ET, we reported apparent information from Big Bear Lake Mayor Jay Obernolte. We have learned that the man we spoke to was not the mayor, so we've removed the information. We regret the error.
[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 were 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.
Dorner – who indicated he was on a campaign of vigilante justice for what he believes was his unfair termination from the LAPD in 2008 – has been the subject of a seven-day manhunt as a suspect in three killings.
Dorner is accused of killing one police officer and wounding two others, as well as killing the daughter of his police union representative and her fiancé.