The suspect, 25-year-old Alek Minassian, was not known to police before Monday's carnage in Canada's most populous city, which also left 15 people injured, police say.
Thousands of students again walked out of classes across the United States on Friday, marking the 19th anniversary of the massacre at Columbine High School with a show of unity aimed at pressuring politicians to enact tighter gun restrictions.
The massacre of 26 people in a Texan church has stirred an ongoing debate over gun ownership, which is protected by the Second Amendment of the US Constitution.
A gunman shooting from a hotel in Las Vegas Strip has killed at least 50 people, making the shooting the deadliest in American history.
As the US mourns the victims of the Orlando mass shooting – the deadliest such incident in the country's history – people are asking how can such crimes be prevented in the future?
US President Barack Obama voices support for gay community, after meeting with relatives of victims of mass shooting in Orlando which took place early in the morning last Sunday.
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