Eleven people have been killed in a shooting at a synagogue in Pittsburgh, Pennsylvania, police have confirmed. The suspect has been detained.

Twelve people have been injured, according to local media. Three officers were wounded, though it remains unclear whether they were counted in that tally.

Police radio chatter suggested the suspect told officers before being detained that "all these Jews need to die" and he didn't "want any of them to live."

READ MORE: ‘All these Jews need to die’: Pittsburgh shooter used AR-15 & handguns in synagogue massacre

The shooter, identified as 46-year-old Robert Bowers, was carrying an AR-15 and a Glock pistol. An additional weapon was found attached to the suspect's ankle, and a pistol was found in his waistband. A "military style package" was being checked inside the synagogue following reports of an explosive device.

The shooting took place at the Tree of Life synagogue on Wilkins Avenue. He apparently shot at officers when they arrived at the scene, forcing them to use their vehicles as shields.

Speaking to reporters, Pittsburgh Public Safety Director Wendell Hissrich became choked up as he said: "It's a very horrific crime scene. It's one of the worst that I've seen and I've been on some plane crashes. It's very bad."

READ MORE: Trump on synagogue massacre: ‘Little to do with gun laws, something has to be done with hate in US’

He added that the FBI will lead the investigation into the shooting, and that despite reports of an explosive device there was no evidence of IEDs being present.

Reports of current active shooter in Tree of Life synagogue on the corner of Shady and Wilkins... Police urging citizens to stay out of the Squirrel Hill area #Pittsburgh#breakingnewspic.twitter.com/mEnpNL4ELV — JacoB.paul (@JacobCBPaul) October 27, 2018

The synagogue was reportedly full of people for a Saturday service when the shooting began. Police received several calls from people barricaded inside the building.

"My father-in-law was inside, I got married in that place. This is crazy. This is unbelievable..." one man emotionally told local news outlet WPXI.

Details of the dramatic police standoff with the shooter emerged via police radio broadcast on the Broadcastify website. An officer at the scene told his colleagues over the police radio that there were "four down in the atrium." Another one said "I've got one alive."

"We need armor," one police officer was heard saying, while another one requested to "open up the back for rescue."

#BreakingNews Active shooter on Wilkins Avenue in Squirrel Hill. Allegheny SWAT on the scene, near Tree of Life synogogue. At least 4 people confirmed dead. — Vanessa Bassi (@vanessa_bassi) October 27, 2018

A SWAT crew was dispatched to the scene and there was a request for breaching equipment on the second floor, as there were rooms with locked doors. An "explosive device" was also mentioned by the officers on the radio.

The shooter was reportedly wearing a green jacket, a blue shirt, and blue jeans. The radio chatter cited his date of birth as September 4, 1972.

I have just arrived on scene on Murray Avenue heavy heavy police presence armed swat along with emergency personnel #wpxipic.twitter.com/IszDhILV78 — Stephen Banfield (@coachtvnews) October 27, 2018

The Pittsburgh Public Safety Department confirmed the active shooter situation shortly after it unfolded. “ALERT: There is an active shooter in the area of WILKINS and Shady. Avoid the area,” it tweeted. Pittsburgh Mayor Bill Peduto traveled to the location of the incident.

As you know, earlier today there was a horrific shooting targeting and killing Jewish Americans at the Tree of Life Synagogue in Pittsburgh, Pennsylvania. The shooter is in custody, and federal authorities have been dispatched to support state and local police... pic.twitter.com/WqO7GfPyMT — Donald J. Trump (@realDonaldTrump) October 27, 2018

US President Donald Trump tweeted that he was watching the events unfold, later stating that the incident was "far more devastating than originally thought."

Events in Pittsburgh are far more devastating than originally thought. Spoke with Mayor and Governor to inform them that the Federal Government has been, and will be, with them all the way. I will speak to the media shortly and make further statement at Future Farmers of America. — Donald J. Trump (@realDonaldTrump) October 27, 2018

The Public Safety Department advised media to stop calling its cell phones. "It is draining batteries and interfering with communications."

ALERT: There is an active shooter in the area of WILKINS and Shady. Avoid the area. More info will be released when it is available. — Pgh Public Safety (@PghPublicSafety) October 27, 2018

Human and Labor Rights Lawyer Dan Kovalik was at the scene shortly after the shooting happened, telling RT that the area is generally a "safe and active place" with "a lot of shops." He found it all cordoned off by police when he arrived.

BREAKING: HEAVY POLICE ACTIVITY AT TREE OF LIFE SYNAGOGUE IN SQUIRREL HILL pic.twitter.com/nHIPehF3ar — Chris Lovingood WTAE (@CLovingoodWTAE) October 27, 2018

#HAPPENINGNOW: Officers in tactical gear walking away from synagogue down Murray Avenue @KDKApic.twitter.com/Tn3GwzbcFB — Meghan Schiller (@MeghanKDKA) October 27, 2018

Israeli Prime Minister Benjamin Netanyahu has spoken out against the shooting, saying he is "heartbroken and appalled" by the "horrendous anti-Semitic brutality."

Think your friends would be interested? Share this story!