New police bodycam video of the nightclub massacre in Florida shows an officer shouting, "Let me see your hands!" to patrons escaping the club.

Patrons' cellphones are heard ringing in the background.

Footage from officers' body-cameras was released this week, almost a year after the worst mass shooting in modern U.S. history.

Forty-nine club patrons were killed when gunman Omar Mateen opened fire at the Pulse nightclub last June 12.

Mateen, who had pledged allegiance to the Islamic State group, was killed in a shootout with police after a three-hour standoff.

Some bodycam footage shows Pulse patrons being checked for weapons by officers after escaping the club with their hands up.

Other footage shows an officer leading a patron out of a bathroom and down a hallway.