Canadian Prime Minister Justin Trudeau also weighed in online, saying in a Saturday tweet that \"Canadians’ hearts are with the Jewish community in Pittsburgh today, as they endured a horrific anti-Semitic attack while at prayer. May the families of those murdered be comforted, and may the injured recover quickly and fully.\"

Canadians’ hearts are with the Jewish community in Pittsburgh today, as they endured a horrific anti-Semitic attack while at prayer. May the families of those murdered be comforted, and may the injured recover quickly and fully.

— Justin Trudeau (@JustinTrudeau) October 27, 2018

Meanwhile, a GoFundMe page has been set up to raise money to help the families of the victims and to help repair the damage to the synagogue from the gunfire.

\"PHOTO:
Alexandra Wimley/Pittsburgh Post-Gazette via AP
PHOTO: From left, Kate Rothstein looks on as Tammy Hepps hugs Simone Rothstein, after multiple people were shot at The Tree of Life Congregation synagogue, Oct, 27, 2018, in Pittsburgh.
>

Politicians from across the political spectrum spoke out, including Democratic Chicago Mayor Rahm Emanuel, who called for unity.

\"We must come together as Americans and empower the better angels of our nature,\" he wrote on Twitter.

Over the past week, across our nation, we have seen the dark forces of hatred, extremism and prejudice boil over into violence. We must come together as Americans and empower the better angels of our nature. pic.twitter.com/4LzeyHE0zx

— Mayor Rahm Emanuel (@ChicagosMayor) October 27, 2018

Outgoing U.S. Ambassador to the United Nations Nikki Haley also posted a note of condolences, saying her \"heart breaks\" for the families of those impacted.

\"An attack on the most sacred of places is the cruelest and most cowardly act a person can do,\" she wrote on Twitter. \"There is and will never be any tolerance for hate.\"

My heart breaks for the families and community of the Tree Of Life Synagogue. An attack on the most sacred of places is the cruelest and most cowardly act a person can do. There is and will never be any tolerance for hate. #PrayersForPeace pic.twitter.com/M9B7LZk9IF

— Nikki Haley (@nikkihaley) October 27, 2018

Actress and comedienne Amy Schumer, who has been a vocal activist for gun control, also wrote that her \"heart is broken for the victims and loved ones of everyone affected by the shooting.\"

My heart is broken for the victims and loved ones of everyone affected by the shooting at the Tree of Life synagogue in Pittsburgh https://t.co/IuMRo5S674

— Amy Schumer (@amyschumer) October 27, 2018

The hometown football team -- the Pittsburgh Steelers -- expressed their sympathies within an hour of the shooting taking place.

\"We send our thoughts and prayers to those affected by this morning’s tragedy in Pittsburgh. We will continue to pray for everyone involved,\" the team wrote on their official Twitter page.

We send our thoughts and prayers to those affected by this morning’s tragedy in Pittsburgh. We will continue to pray for everyone involved.

— Pittsburgh Steelers (@steelers) October 27, 2018

Talk show host Seth Meyers, who has Jewish members of his family and whose father is from Pittsburgh, also posted about the shooting, writing: \"My heart goes out to Pittsburgh, a city that is near and dear to me.\"

My heart goes out to Pittsburgh, a city that is near and dear to me.

— Seth Meyers (@sethmeyers) October 27, 2018

Actress and singer Mandy Moore tweeted about the news of the attack, sending her support to anyone impacted by gun violence and pointing to the elections as an opportunity for people to vote on the issue.

\"My heart goes out to all those affected by gun violence today and every day. Feeling helpless and frustrated by this news too? VOTE Nov 6th. VOTE. Use your voice. #GunSenseCandidates,\" she wrote on Twitter.

My heart goes out to all those affected by gun violence today and every day. Feeling helpless and frustrated by this news too? VOTE Nov 6th. VOTE. Use your voice. #GunSenseCandidates https://t.co/LCi3ufyMJH

— Mandy Moore (@TheMandyMoore) October 27, 2018
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