Watch 123Movies. A documentary that provides an account of the tragic events that unfolded on June 26, 2015, at the Riu Imperial Marhaba Hotel in Sousse, Tunisia. This attack, carried out by a lone gunman affiliated with ISIS, resulted in the deaths of 38 people, including 30 British tourists, making it the deadliest terror attack on Britons abroad since the 2005 London bombings.