Investigators remained on scene early Saturday morning in Pomona where one officer was fatally shot and another officer was wounded while responding to a barricaded suspect, officials said.

“It is with a heavy heart that I must report that one officer did not survive,” Pomona police Chief Michael Olivieri tweeted just after 1:30 a.m. “The second officer is in stable condition.”

It is with a heavy heart that I must report that one officer did not survive. The second officer is in stable condition. — Chief Michael Olivieri (@olivieri_ppd) March 10, 2018

The two Pomona police officers were struck by gunfire while responding to a call in the 1400 block of South Palomares Street. The initial call came in at 9:10 p.m. Friday, according to a Los Angeles County Sheriff’s Department news release. Homicide detectives are assisting Pomona Police Department with the investigation.

Paramedics were called to the area of Palomares Street and Phillips Boulevard for the wounded officers, according to a Los Angeles County Fire Department dispatcher, who then referred all questions to Pomona police.

Olivieri tweeted late Friday night that two officers had been shot and that scene was still active as of 11:30 p.m. SWAT also had been summoned to the scene, according to Olivieri.

2 Pomona officers have been shot, scene still active. SWAT on scene. I’ll provide a better update soon. — Chief Michael Olivieri (@olivieri_ppd) March 10, 2018

The sheriff’s Special Enforcement Bureau (SEB) Special Weapons Team and Crisis Negotiation Team also responded to assist Pomona Police Department with the armed barricaded suspect.

The teams responded “to help bring the situation to a peaceful resolution,” according to a SEB release.

A Pomona Police Department dispatcher refused to give further information about the shooting except to say they were responding to a “critical incident.”

Law enforcement agencies from across Southern California began tweeting out support for the Pomona Police Department as news spread of the shooting.

“Our thoughts and Prayers are with @PomonaPD tonight as an officer has been shot,” the Los Angeles County Sheriff’s Department tweeted. “We are here to support our LE brothers and sisters in anyway they need us.”

Our thoughts and Prayers are with @PomonaPD tonight as an officer has been shot. We are here to support our LE brothers and sisters in anyway they need us #LASD pic.twitter.com/FIE5IRhvJ1 — LA County Sheriff's (@LASDHQ) March 10, 2018

“A very tragic day for LE & the officers family,” the El Monte Police Department tweeted out just minutes after the announcement was made that one officer had died.

No further details were available about what prompted the barricade situation or if the suspected shooter was in custody.

Video and photos from the incident showed law enforcement swarming the scene and one of the officers receiving CPR. Pomona residents also took to Twitter to describe hearing gunfire and sirens.

Sounds like all hell is breaking loose in Pomona — Bryan Herbert (@KE6ZGP) March 10, 2018

What’s up with all these sirens 🚨 here in Pomona it’s definitely not a medical call — Noe Araujo Silva Jr (@LA_FireFvture) March 10, 2018

POMONA IS REALLY CRAZYYYYY. HEARING GUN SHOTS. Omg — jess (@jessicaarosales) March 10, 2018

@ivdailybulletin some kind of chase has been going on near my home in Pomona. We have been hearing nonstop sirens for nearly an hour now and sounds like multiple shots fired. I live near Simons Middle School. — Natalie Sierra (@PandoraDemise) March 10, 2018

Anyone with information is asked to contact the L.A. County sheriff’s Homicide Bureau at (323) 890-5500. Anonymous tips can also be left at (800) 222-TIPS (8477) or http://lacrimestoppers.org.