Pro-Palestinian activists say they were subjected to severe abuse, including broken bones, humiliation and sexual assault, after being detained by Israeli authorities for taking part in a Gaza-bound aid flotilla last month.

The allegations, which Israel denies, have triggered multiple international investigations and growing diplomatic pressure.

France, Italy and Australia have opened inquiries following the detention of more than 430 activists from around the world involved in the latest attempt to break the blockade on the war-damaged Gaza Strip.

French nationals Meriem Hadjal, Noe Tissot and Malika Baouya were aboard the vessel Peluxo, which was carrying school supplies, infant formula and medical aid when Israeli speedboats intercepted it in international waters.

The activists said they were taken from the boat and violently herded together at sea onto what some described as a “torture prison ship.”