Police have pieced together a more accurate timeline of the shooting at Pulse Nightclub on June 12th.

Investigators in Orlando are piecing together information on the man who committed the worst terrorist attack on U.S. soil since 9/11 and the worst mass shooting in modern American history.

The AR-15, or the Armalite Rifle-15, is the civilian version of the M16 rifle used by the U.S military and is classified as a restricted weapon in Canada.

Caroline Stephenson built this animation that shows a timeline of deadliest mass shootings over the past years.