The dead include a 97-year-old woman, a husband and wife, and two brothers - all of whom were at services inside the Tree of Life synagogue when Robert Bowers allegedly burst in through an open door, screaming anti-Semitic slurs and shooting.
At least six other people, including four police officers, were wounded before the man was arrested.
"I mean the world has violence".
The mayor also disputed President Donald Trump's suggestion that the synagogue should have had armed guards.
Thousands of mourners attended an interfaith memorial service in Pittsburgh on Sunday evening to mourn what is believed to be the deadliest attack on the Jewish community in US history.
"I helped pull out the people that I could from the front", he said.
"I wish I knew what was going on inside his head".
The FBI said Bowers was not previously known to law enforcement before he drove to the synagogue on Saturday morning, as three different congregations celebrated the Jewish Sabbath inside.
Stein once served as president of the New Light Congregation, one of the three congregations that were housed in the synagogue building, the Pittsburgh Tribune-Review reported.
Hissrich said extra patrols have been assigned to "sensitive locations around Pittsburgh", including at a vigil planned for Sunday night. That's who he was.' Rose Mallinger Rose Mallinger, a 97-year-old from Squirrel Hill, was the 'sweetest, lovely lady, ' said Friedman, who said Mallinger was a secretary in her school's office growing up.
Among the 11 who were killed are a former deputy district attorney, two brothers and a couple who had been married at that synagogue. One officer was described as critically wounded; the document did not describe the other officer's condition. The pair exchanged gunfire, Jones said, and Bowers re-entered the building before a SWAT team arrived.
Six people were injured in the attack, including four officers. "After a standoff with police, Bowers eventually surrendered, and remains in federal custody today", Brady said.
On Sunday, Karl Williams, Allegheny County's chief medical examiner, released the victims' identities in a news conference. "If somebody didn't come that was supposed to lead services, he could lead the services and do everything".
News of the attack spread quickly through the surrounding neighborhood.
And Jewish leaders expressed concern about what they said was a spike in anti-Semitic acts in the past two years.
"We know that we as a society are better than this", he added.
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Police say Mann is facing multiple criminal charges in the US , but will be extradited to Canada to face one count of abduction. She then added while he liked the chicken he "loved" the squash she made and she said she promised to make him more next time.
Meanwhile, Bowers's home and auto was were due to be searched, and investigators have begun to scour his reportedly extensive social media feeds. "My mother always taught me that if you don't have anything nice to say, don't say it". State authorities have also leveled charges.
Federal prosecutors charged Bowers late on Saturday with 29 criminal counts including violating USA civil rights laws.
York regional police, north of Toronto, and Ottawa police said there was no increased threat, but they were monitoring Jewish community centres and synagogues as a precaution.
"We are obviously so grateful that it wasn't any more tragic than it already was".
It followed a spate of pipe bombs found mailed in recent days to prominent political figures ahead of Nov 6 congressional elections.
He had an assault rifle and three handguns at the time of the attack, which lasted around 20 minutes, Jones said.
The remaining victims were from other parts of Pittsburgh, the second-largest city in Pennsylvania after Philadelphia.
Jerry Rabinowitz, 66, came from Edgewood Borough, Pennsylvania, and was a primary care physician in the area for many years, some of his patients told CNN. "I don't need thoughts and prayers - I need change". "I don't think it's will be in your face, but knowing they are there will make us feel safe and protected". "Where are our leaders?"
THE suspect in a mass shooting at a synagogue in the U.S. that saw 11 people killed had accused Jews of genocide.
Trump has strongly condemned the synagogue attack.
Trump ordered that the USA flags at the White House and public buildings be flown at half-staff.
United States attorney general Jeff Sessions said the charges "could lead to the death penalty".
Some of Canada's premiers also weighed in, with Ontario's Doug Ford saying we must work together to "defeat anti-Semitism and bigotry in all its forms", and newly minted Quebec Premier Francois Legault calling for people to "unite against hatred and racism".
"When people do this, they should get the death penalty", Trump said at the campaign rally at the Southern Illinois Airport.
Pittsburgh Mayor Bill Peduto disagreed.
"We will spare no effort or resource in ensuring that the defendant is held fully accountable for his unspeakable and hateful crimes", Brady told reporters.