It had been less than two weeks since the last mass killing in Texas.
The person accused of killing five people in a Colorado LGBTQ club changed their name in 2016.
Six people were killed when a man drove a car through a crowd last year. Now the driver is turning the trial into a spectacle, trying to represent himself.
The RCMP initially said they captured the suspect in a stabbing rampage that killed 10 people. Several hours later, they said he was dead.
Police have told VICE News they are familiar with the posts and are investigating.
A public inquiry into the Nova Scotia mass shooting that killed 22 people has revealed numerous mistakes by police.
The gunman, who killed five people at several locations in Denver, was a small figure in a hyper-masculine part of the far-right.
One expert told VICE that laying charges in a case like this shows a “fundamental misunderstanding of terrorism.”
Bryan Riley, 33, who confessed to killing four (including a baby) and torturing a young girl in Lakeland, Florida, told police he believed he was saving a child that was being sexually trafficked by the family.
New documents show multiple people knew the killer was abusive towards his wife and one said he spoke often of disposing bodies.
A former neighbour, a Canadian Forces veteran, says she told police about the gunman’s weapons and domestic violence and nothing was done.
RCMP say they also found out where the gunman hid overnight before he started his second wave of killings.