Police were investigating a single suspect in a shooting at a Quebec City mosque that killed six people, with a second person who was arrested now considered a witness.
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The sole suspect in the attack, which occurred during Sunday evening prayers was Alexandre Bissonnette, a French-Canadian university student, according to a source familiar with the matter.
The man now considered a witness was of Moroccan descent although his nationality was not immediately known - he was named by local media as Mohammed Belkhadir
Police declined to give details of those arrested or possible motives for the shooting at the mosque.
Authorities initially said they had arrested two suspects, but in a Twitter message, the Royal Canadian Mounted Police said that "following the investigation, the second individual is now considered as a witness."
Police said on Monday morning they were confident no other suspects were involved in the attack.
"They consider this a lone wolf situation," the source said.
In addition to the six killed, five people were critically injured and 12 were treated for minor injuries, a spokeswoman for the Quebec City University Hospital said.
Canadian Prime Minister Justin Trudeau earlier called the shooting "a terrorist attack on Muslims."
US President Donald Trump called Trudeau to express his condolences "and offered to provide any assistance as needed," said Trudeau spokesman Cameron Ahmad.
The shooting came over a weekend when Trudeau said Canada would welcome refugees, speaking in response to Trump's order to halt the US refugee program and to temporarily bar citizens from seven Muslim-majority countries from entering the United States.
Trump's action, which the president said was aimed at protecting Americans from the threat of attacks by militant Islamists, was widely condemned in the United States and abroad as targeting Muslims.
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