Al Jazeera on Monday broadcasted footage from the Gaza flotilla's lead vessel, the Mavi Marmara, showing Israeli Navy commandos boarding the ship.
Helicopters could also be seen flying overhead.
According to IDF reports, at least 10 activists were killed during the ensuing clashes as well as six Navy commandos, some of them from gunfire and at least one in serious condition with a head wound. Foreign reports claimed that the number of dead was close to 15.
Yaakov Katz contributed to this report