On Saturday President Trump said the outcome at the Pittsburgh synagogue would have been different if there was armed protection.
Officials said on Sunday that the suspected perpetrator - 46-year-old Robert Bowers - likely acted alone.
The shooting rampage that killed 11 people at Pittsburgh's Tree of Life Synagogue on Saturday is being decried as the deadliest attack on Jews in US history, allegedly carried out by a virulently anti-Semitic gunman.
Bowers, who authorities said used an AR-15 rifle and three handguns in the attack, told an officer while he was being treated for his injuries "that he wanted all Jews to die and also that they (Jews) were committing genocide to his people", a Pittsburgh police affidavit said.
Recalling the harrowing moments of the Saturday morning shooting in an interview on the "Today" show, Jeffrey Myers also called on US President Donald Trump to "tone down rhetoric" and take action against hate.
Bowers was a long-haul trucker who worked for himself, U.S. Attorney Scott Brady said Sunday.
The rabbi, who had helped pull people out of the synagogue after the attack, chanted a memorial prayer in Hebrew, wiping his eyes with a handkerchief.
Rapid reaction SWAT members leave the scene of a mass shooting at the Tree of Life Synagogue in the Squirrel Hill neighbourhood on 27 October 2018 in Pittsburgh, Pennsylvania.
Pittsburgh Mayor Bill Peduto responded by hailing the vibrancy of the Squirrel Hill neighborhood where the attack unfolded, saying it is the most diverse part of western Pennsylvania.
It followed a spate of pipe bombs found mailed in recent days to prominent political figures, mostly Democrats including former U.S. President Barack Obama, ahead of November 6 congressional elections.
Joyce Feinburg, 75, of Oakland, Pa.
2 teams poach Rays staff for new manager
Baldelli, a Rhode Island native, played seven seasons in the Major League Baseball for Tampa Bay and Boston. As it turns out, the Twins were looking for a younger manager that could communicate well with millenials .
Meghan and Harry given traditional Maori greeting in New Zealand
When it was Harry's turn to take to the stage, he offered his thanks, particularly to the athletes who competed in the games. The newlywed posted a snapshot of her husband, Prince Harry , at the Invictus Games closing ceremony rehearsal Saturday.
Red Bull-Honda can fight for 2019 title - Marko
The 21-year-old is tipped to repeat last season's heroics in Mexico City, where Verstappen dominated to win the race. Ricciardo, 29, retired while running fourth in the race when his vehicle shut down just eight laps into the event.
David Rosenthal, 54, of Squirrel Hill, Pa.
But while both migrants and Muslims have been frequent targets of Donald Trump, Bowers was no fan of the U.S. president, whom he derisively dismissed as a "globalist" and not a "nationalist".
Shafir said his organization regularly meets with the Edmonton Police Service and officials are aware of extra security the community requires. When he realized it was gunfire, he ordered everyone in the sanctuary to drop to the floor and remain silent, hoping that the wooden pews would protect them from the bullets. "We will not try to rationalize irrational behavior".
"We're gathered here for a very sad occasion - to remember our brothers and sisters who had their lives taken away from them. And that's because of our first-responders", Pittsburgh resident Molly Butler told Global News.
A social media post by synagogue shooting suspect Robert Bowers. During the attack, he reportedly shouted "All Jews must die". He faces at least 29 federal charges including hate crimes.
Bowers had made many anti-Semitic posts online, including one early on Saturday.
"What happened yesterday will not break us", said Rabbi Jonathan Perlman, of New Light Congregation, holding back tears.
Federal prosecutors have confirmed they will seek the death penalty for the Pittsburgh synagogue shooter who slaughtered 11 people and injured six more during morning services on Saturday. "Screw your optics, I'm going in", he wrote.
More than half a century ago, when four young girls were killed in a Birmingham church by a racist's bomb, Dr. King told us that those little girls "have something to say to every politician who has fed his constituents with the stale bread of hatred and the spoiled meat of racism...."
"In reality, all of us are wounded by this inhuman act of violence", he said. In Fairfax County, Virginia, where I reside, the Jewish Community Centre of Northern Virginia was vandalised this month by 19 swastikas painted on the building.
In Israel, cabinet ministers stood for a moment of silence on Sunday to honour the victims of the shooting.