Six men were killed, and five others critically injured, in a shooting at a Quebec City mosque Sunday night. The following is a chronology of the response by police and government officials.

Sunday

At 7:50 p.m., police received several calls from the Centre Culturel Islamique de Quebec reporting that shots had been fired.

Police quickly arrive on site and arrest one suspect.

Officers go inside the mosque and realize there are many victims. The attack is considered a major incident. All available police staff in Quebec City, including canine units, are called in.

Police set up a security perimeter around the site.

At 8:10 p.m., a man calls 911 asking to speak with investigators. He tells police he will wait for officers at an access road near the Ile-d’Orleans bridge.

Police go to the meeting spot and arrest the suspect.

More officers go to the mosque to provide support for those on scene. A command post is established.

At 10 p.m., an RCMP national security task force is deployed.

Security is increased at other mosques in the city as well as the Universite Laval campus.

Monday

At 9 a.m., Quebec City police and Quebec provincial police hold a press conference confirming that two suspects are in custody. Both are men, in their 20s or early 30s. Police say they do not believe there are any other suspects.

At 11 a.m., Quebec City Mayor Régis Labeaume tells reporters that city officials have been speaking with members of the Centre Culturel Islamique and the Muslim community at large to determine what support they need in the wake of the shooting.

At 11:45 a.m., the Star reports that U.S. President Donald Trump has spoken with Prime Minister Justin Trudeau, expressing his condolences and offering his assistance.

Just before noon, officials at l’Hôpital de l’Enfant-Jésus in Quebec City say two of the men injured in the shooting remain in serious condition, and will require additional surgery but are expected to live. The other three men critically injured in the attack are stable and will be released from hospital soon, officials said at a press conference.

At noon, Laval University identifies Professor Khaled Belkacemi as one of those killed in the shooting. In a written statement, Laval officials described Belkacemi as an esteemed member of the faculty, beloved by students and colleagues. Mohamed Labidi, vice-president of the mosque, told The Candian Press that Belkacemi had one child.

Shortly after noon, Quebec provincial police announce via Twitter than only one of the men arrested Sunday night is still considered a suspect. Following an investigation, they said, the second man is now being considered a witness.

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At 1:15 p.m., Trudeau rises in the House of Commons to call for peace and unity in response to the shooting. “Canadians will not be intimidated. We will not respond to violence with violence. In the face of hate, we will respond with love,” Trudeau says.

Conservative party leader Rona Ambrose and NDP leader Thomas Mulcair each make remarks following Trudeau. “Today our hearts are broken,” said Mulcair. The attack violates our basic right to practice our religion, said Ambrose.

Shortly after 3:30 p.m., The Canadian Press reports the IDs of two more of the victims, Azzedine Soufiane, a father of three who ran a grocery and butcher shop; and Abdelkrim Hassen, a father of three who worked in government information technology.

At approximately 3:40 p.m., Public Safety Minister Ralph Goodale said Canada’s terrorism threat level will remain at “medium,” where it has been since the Parliament Hill shooting of October 2014.

At approximately 5 p.m., the Star obtains court documents indicating that Alexandre Bissonnette faces six counts of first degree murder and five counts of attempted murder in connection with mosque shooting.

At around 5:20 p.m., Laval University releases a written statement saying Bissonnette studied social sciences at Laval. The university says he has been barred from any further studies or research at the school as of today.

At 5:30 p.m., the Office of the Coroner of Quebec releases the names and ages of all six victims: Mamadou Tanou Barry, age 42, Abdelkrim Hassane, age 41, Khaled Belkacemi, age 60, Aboubaker Thabti, age 44, Azzeddine Soufiane, age 57 and Ibrahima Barry, age 39.

Shortly after 6 p.m., Trudeau attends a vigil in Quebec City for victims of the shooting. “Muslim Canadians are valued members of every community and, wherever they live, they deserve to feel welcome and safe,” Trudeau said. “They are home here.”

Read more:

Two Quebec City mosque shooting suspects arrested have no criminal history

Trudeau going to Quebec City in wake of mosque attack

Canadian Muslims’ fear over safety grows after Quebec City mosque attack