Trump also doubled down on earlier calls to invoke the death penalty.
"In light of the recent shooting in Pittsburgh, please do not be alarmed if you see heightened police presence in and around houses of worship", the post read.
Bowers is said to be a Pittsburgh resident.
He said that any motive remains unknown but that authorities believe he was acting alone.
He also says the crime scene is one of the worst many professionals have seen.
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The suspect surrendered after a tense and violent standoff with SWAT at the Tree of Life Congregation in Pittsburgh's Squirrel Hill neighborhood, CBS Pittsburgh reports.
President Donald Trump told reporters at Joint Base Andrews in Maryland that the shooting was a "terrible, bad thing".
With both the death toll and details of the synagogue's security still to be disclosed, Trump said gun control "has little to do with it" but "if they had protection inside, the results would have been far better".
Stephen Weiss was inside the synagogue when the shooting began.
Police say Bowers was armed with an AR-15-style rifle and three handguns.
"May the memory of the murdered be blessed", he concluded.
A victims' center with grief counselors has been set up for survivors.
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Paul Wood, the chief communications officer for the hospital system, said the patients are receiving care at UPMC Presbyterian, but he would not say how many.
Police in Pittsburgh said there were "multiple casualties" and that a suspect was in custody.
The SWC expressed its condolences to the families of the victims of Saturday's shooting.
All four police officers are in stable condition, officials said. "Today, we are all Squirrel Hill". "God Bless All!" he said on Twitter.
A man yelling "all Jews must die" burst into a Pittsburgh synagogue during Sabbath services Saturday, shooting indiscriminately and killing congregants in the latest mass shooting in the United States.
Five minutes later, at 9.54am, police received the first 911 calls reporting an active shooter in the synagogue.
The officers' injuries are not life-threatening, according to Hissrich.
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"ALERT: There is an active shooter in the area of WILKINS and Shady".