Six people were killed in a shooting Sunday night at a mosque in Quebec City, Canada, and it is being investigated as an act of terrorism.

  • 6 dead after shooting at Quebec City mosque
  • 2 initially arrested, but Quebec Police say just 1 is a suspect
  • No group has claimed responsibility for the attack

Witnesses said at least two gunmen wearing black entered the Quebec Islamic Cultural Center during worship and opened fire Sunday night.

Six people were killed and more than a dozen others were hurt, including six being described as critical. The dead ranged in age from age 35 to 65, Quebec provincial police spokeswoman Christine Coulombe said.

Police initially said two people were arrested.

Quebec City court clerk Isabelle Ferland initially identified Alexandre Bissonnette and Mohamed el Khadir as the suspects, but Quebec Police later said just one of the individuals arrested is considered a suspect, according to the Associated Press.

Police didn't say which one remains the suspect in the Sunday night attack.

Police do not believe there are other suspects. They did not immediately speculate on a possible motive.

The Canadian province's premier called this an act of terrorism in a tweet.

Editor's note: Here is the tralations, from Bing, of this tweet: "Let us unite against violence. Solidarity with Quebecers of the Muslim faith."

Many are offering their condolences online, including Canada's Prime Minister Justin Trudeau.  

New York City Mayor Bill de Blasio also tweeted about the attack.

The New York Police Department stated it is be giving "special attention" to all New York City mosques to prevent anything like this from happening there.

Information from The Associated Press was used in this report.