Tributes began pouring in from around the world soon after the shooting at a mosque in Quebec City Sunday that killed six people.
Two men were taken into custody after what Quebec Premier Philippe Couillard described as a "murderous act directed at a specific community." One is considered a suspect, and the other a witness, Quebec provincial police say.
Prime Minister Justin Trudeau called the attack "cowardly" on Twitter. He later issued a statement describing it as an act of terrorism.
Tonight, Canadians grieve for those killed in a cowardly attack on a mosque in Quebec City. My thoughts are with victims & their families.
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@JustinTrudeau
Couillard called the shooting "barbaric."
Le #Québec rejette catégoriquement cette violence barbare. Toute notre solidarité aux proches des victimes, des blessés et à leur famille.
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@phcouillard
Russian President Vladimir Putin sent a message to Trudeau, offering "my deep condolences in connection with the tragedy in Quebec."
"The murder of people who gathered for a prayer in a mosque is shocking by its degree of violence and cynicism," he said.
A spokeswoman for Trudeau said U.S. President Donald Trump also "offered to provide any assistance as needed.''
New York City Mayor Bill de Blasio was among the first to react to the shooting, tweeting the cities must "stand together."
Our prayers tonight are with the people of Quebec City as they deal with a terrible attack on a mosque. We must stand together.
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@NYCMayor
The Twitter accounts for the Black Lives Matter and womens' march protest movement tweeted their solidarity with the Muslim community in Quebec City.
We stand with the Muslim community in #QuebecCity
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@Blklivesmatter
Our hearts are with our Muslim brothers and sisters in #QuebecCity.
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@womensmarch
The City of Paris is turning off the Eiffel Tower's lights starting at midnight tonight in respect for the victims of the Quebec City mosque shooting.
Paris est avec @villequebec.
En hommage aux victimes de l'attentat survenu cette nuit, @LaTourEiffel sera éteinte à partir de minuit. pic.twitter.com/cVjJr2xXax
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@Paris
Bruce A. Heyman, former U.S. ambassador to Canada, sent his condolences to the families and communities in Quebec City.
.@vshey and I are saddened by the senseless attack on the innocent in Quebec last night & send our condolences to the families and community
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@BruceAHeyman
A Twitter account, purported to be run by a seven-year-old girl who recently fled Syria, also expressed support.
Dear Quebec, God bless the dead and alive.
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@AlabedBana
