[Osem]

About the gunman:

"We have no idea what his belief system was. Right now, we believe he was the sole aggressor and the scene is static," Sheriff Lombardo said, adding that the attack was not related to terrorism.

He described the suspect as a "distraught person intending to cause mass casualties", adding that he killed himself as police approached the hotel room.

He had no prior "derogatory" interactions with police, said Sheriff Lombardo, except for one citation several years ago which the sheriff declined to describe.

http://www.bbc.co.uk/news/world-us-canada-41472462