Seven of the victims were reported to have died.
A police official says there are "multiple casualties" in a shooting near a synagogue in Pittsburgh. The synagogue, one of the oldest and largest in the city, was full with a Saturday service.
There were also reports that the suspect brought an explosive device into the synagogue and an Explosive Ordnance Disposal (EOD) unit has been dispatched to comb through the building. The suspect, identified as Robert Bowers, has reportedly been taken into custody by the city police after he was injured during an exchange of fire, suggest local U.S. media reports. In his bio section on Gab, Bowers wrote: "Jews are the children of Satan".
'My father-in-law was inside, I got married in this place, this is insane, ' the witness told reporters at the scene. "Screw your optics. I'm going in".
HIAS is a nonprofit that describes itself as "helping refugees rebuild their lives in safety and sanity".
Pittsburgh mourns the deadliest attack on Jews in U.S. history
Social media posts apparently made by Bowers indicated hatred of Jews.
Trump has advocated for arming teachers and increasing the number of armed officers in schools in response to calls for tougher gun control measures following school shootings in Florida and Texas. In another message, Bowers wrote of Trump, "For the record, I did not vote for him nor have I owned, worn or even touched a maga hat".
Donald Trump has already responded to the news via Twitter, stating: "Watching the events unfolding in Pittsburgh, Pennsylvania". A law enforcement official earlier told CNN at least 12 people have been shot. All good Americans stand with the Jewish people to oppose acts of terror & share the horror, disgust & outrage over the massacre in Pittsburgh.
"Looks like multiple fatalities", President Trump reacted on Twitter shortly after 11 a.m. local time. "Beware of active shooter", he posted.
President Trump said Saturday that "it's a awful, bad thing what's going on with hate in our country, frankly, and all over the world", but said the shooting had "little" relation to gun laws: "If they had protection inside, the results would have been far better".
"This is an absolute tragedy", tweeted Mr. Wolf, a Democrat.
REUTERS/John Altdorfer Police and medical personell gather on the side of Tree of Life Synagogue on Saturday, Oct. 27, 2018, in Pittsburgh.