Video Shows Frantic Moments in Tunisian Hotel Attack

Harrowing footage taken during the attack on a Tunisian beach-side resort shows the chaos facing tourists as they were running for safety.

The video was shot by one of the employees at the Imperial Marhaba Hotel, according to the BBC, when the shooting unfolded on Friday morning.

Two different portions of the footage captured what appears to be the alleged shooter, covered head-to-toe in black clothing. In one shot, what looks to be a machine gun is seen slung over one of his shoulders.

The suspect has been identified by Tunisian authorities as Seifeddine Rezgui, a 24-year-old student who was fatally shot by police after killing 38 people.

The man filming the video is heard screaming out warnings to others, including one portion where he says the attacker "has grenades" after explosions can be heard.

"Why are you killing people brother? These are tourists," the man taking the video is heard saying, though it is unclear how close he is to the shooter at that time.

ISIS claimed responsibility for the attack in a statement circulated on social media on Friday.

Security official Rafik Chelli told Tunisian radio station Mosaique FM that the gunman hid his Kalashnikov rifle under an umbrella before he opened fire at the hotel near the town of Sousse. The gunman then entered the Hotel Imperial through the pool and shot at people, Chelli told Mosaique FM.

Sousse is one of Tunisia's most popular vacation spots and draws visitors from across Europe -- particularly France.

The nationalities of the victims are still being determined, officials said, but a security official confirmed to Mosaique FM that many victims were foreigners. At least 18 victims were British, according to British Prime Minister David Cameron's office.