‘Multiple casualties,’ 3 officers shot at Pittsburgh synagogue: Officials.

USA: A suspect is in custody after multiple people were killed and three officers were shot at a Pittsburgh synagogue Saturday morning, authorities said.

Police responded to reports of active gunfire at the Tree of Life*Or L’Simcha congregation, according to Pittsburgh Public Safety commander Jason Lando.

Rabbi Alvin Berkun, who was not in the building at the time, told ABC News he was “stunned” and “sorry” to hear of the shooting. He said he had stayed home from services Saturday morning because his wife was sick and that he has not heard from friends who were in the building.

Berkun, who lives nearby the synagogue, said police officers came to his door and told him to stay inside his home. He called the neighborhood of Squirrel Hill, where the synagogue is located, “a very Jewish neighborhood” that is “known as a Jewish community.”

“There’s absolutely no crime, it’s an amazing neighborhood, it’s hard to believe it’s a city neighborhood,” Berkun said. “It’s dominated by the Jewish community center four blocks away, it’s dominated by kosher bakeries, all kinds of Jewish gift shops, bookshops, a number of synagogues. There is one major synagogue but there are at least five other synagogues within two miles of where we are.”

When the gunman opened fire at the synagogue, law enforcement officers, including agents from the FBI and the Bureau of Alcohol, Tobacco and Firearms, immediately responded to the scene.

The suspect was apprehended a short time later, but Pittsburgh Mayor Bill Peduto warned residents to continue to stay away from the synagogue.

The synagogue is a conservative Jewish congregation, according to its website, and there was a morning Shabbat service scheduled from 9:45 a.m. to noon.

Berkun said there are “three different religious groups that are meeting in our building on Saturday morning with three distinct services,” estimating that there could have been approximately 75 people in the building at the time.

Speaking to reporters before boarding a flight for an event in Indiana, President Donald Trump called it “a shame,” calling the suspect “a wacko” and a “maniac.” He also said the suspect should “pay the ultimate price” and be subjected to the death penalty.

When asked about whether the nation’s gun laws should be changed, Trump said the synagogue should have had armed security there.

“You want protection, and they didn’t have any protection, they had a maniac walk in,” Trump said. “The results could have been much better.”

He said that before getting into office, he would think “what a shame, what a shame” when incidents like this one unfolded.

“It’s even tougher when you’re the president of the United States and you have to watch this thing happen,” Trump said.

Earlier, Trump tweeted that he has been in touch with the mayor and governor, writing, “Events in Pittsburgh are far more devastating than originally thought.