QUEBEC CITY/TORONTO, Jan 30 (Reuters) - A French-Canadian university student was the sole suspect in a shooting at a Quebec City mosque and was charged with the premeditated murder of six people, Canadian authorities said on Monday, in what Prime Minister Justin Trudeau called a terrorist attack.

Court documents identified the gunman in the attack on Sunday evening prayers as Alexandre Bissonnette, 27, and charged him with six murder counts and five counts of attempted murder with a restricted weapon. The slightly-built Bissonnette made a brief appearance in court under tight security wearing a white prison garment and looking downcast.

Prosecutors said all of the evidence was not yet ready and Bissonnette was set to appear again on Feb. 21. No charge was read in court and Bissonnette did not enter a plea.

The charges laid correspond to the evidence available, said Thomas Jacques, a representative of the prosecutors office, when asked why Bissonnette was not charged with terrorism-related offenses.

Among the six men killed were a butcher, a university professor, a pharmacist and an accountant, according to police and Canadian media.

Police declined to discuss possible motives for the shooting at the Centre Culturel Islamique de Qubec.

They consider this a lone wolf situation, a Canadian source familiar with the situation said.

In Washington, U.S. government security experts were leaning to the view that the gunman most likely was motivated by hatred for Muslims, a U.S. government source familiar with official reporting said.

A man of Moroccan descent who had also been arrested was now considered a witness, although his nationality was not immediately known, the Canadian source said.

Trudeau, who has made a point of welcoming refugees and immigrants from Muslim-majority countries, told parliament in Ottawa: Make no mistake, this was a terrorist attack.

He added a personal message to Canadas 1 million Muslims:

Know that we value you. You enrich our shared country in immeasurable ways. It is your home. Last nights horrible crime against the Muslim community was an act of terror committed against Canada and against all Canadians. We will grieve with you. We will defend you. We will love you. And we will stand with you.

Trudeau also issued a statement to the press condemning the attack.

We condemn this terrorist attack on Muslims in a centre of worship and refuge.

On behalf of all Canadians, Sophie and I offer our deepest condolences to the family and friends of all those who have died, and we wish a speedy recovery to those who have been injured.

While authorities are still investigating and details continue to be confirmed, it is heart-wrenching to see such senseless violence. Diversity is our strength, and religious tolerance is a value that we, as Canadians, hold dear.

Muslim-Canadians are an important part of our national fabric, and these senseless acts have no place in our communities, cities and country. Canadian law enforcement agencies will protect the rights of all Canadians, and will make every effort to apprehend the perpetrators of this act and all acts of intolerance.

Tonight, we grieve with the people of Ste-Foy and all Canadians.

I want to express my disgust against this villainous act , Quebec City Mayor Rgis Labeaume said at a Sunday news conference. I want to tell the members of the Muslim community, those who are our neighbours, our co-citizens, that they can count on our support, our solidarity, but mostly I want to tell them that we love them.

New York City Mayor Bill de Blasio (D) announced that police would provide additional protection for mosques in the city following the attack.

Somber parliamentarians observed a moment of silence. Trudeau was scheduled to visit QuebecCity later on Monday.

The attack was out of character for Quebec City, a city of just over 500,000 which reported just two murders in all of 2015. Mass shootings are rare in Canada, where gun control laws are stricter than in the United States.

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.

Federal Safety Minister Ralph Goodale told reporters in Ottawa there was no change to the national terrorism threat level from medium because there is no information known to the government of Canada that would lead to a change at this time.

U.S. President Donald Trump called Trudeau to express his condolences and offered to provide any assistance as needed, said Trudeau spokesman Cameron Ahmad.

Over the weekend, Trudeau said Canada would welcome refugees, his response to an executive order by Trump on Friday to halt the U.S. refugee program and to temporarily bar citizens from seven Muslim-majority countries from entering the United States.

Trumps action, which the president said was not about religion - this is about terror and keeping our country safe, was widely condemned in the United States and abroad as targeting Muslims.

On Monday, White House spokesman Sean Spicer told reporters that the Quebec shooting was a terrible reminder of why we must remain vigilant, and why the president is taking steps to be proactive, rather than reactive, when it comes to our nations safety and security.