A group of activists organizing an aid boat for Gaza said it was attacked on Friday by drones in international waters off Malta as it headed towards the Palestinian territory.
The Maltese government and Cypriot rescuers said they had responded to a distress call from the vessel, while Malta said all crew members were safe and made no mention of an alleged attack.
The activists said they suspected Israel could be behind the attack, and Cyprus's rescue agency said it had been informed by the island's foreign ministry of an Israeli drone strike.
The Israeli military did not provide an immediate response when contacted by AFP.
"At 00:23 Maltese time (2223 GMT Thursday), the Conscience, a Freedom Flotilla Coalition ship came under direct attack in international waters," the group said in a statement.
"Armed drones attacked the front of an unarmed civilian vessel twice, causing a fire and a substantial breach in the hull.
"Israeli ambassadors must be summoned and answer to violations of international law, including the ongoing blockade and the bombing of our civilian vessel in international waters."
Asked whether the group believed Israel was behind the attack, a spokesperson told AFP they "suspected" that was the case.
"While we cannot confirm 100%, we suspect it's Israel," Hay Sha Wiya said, calling the country "the primary entity interested in keeping us and any aid out of Gaza".
Israel is known for conducting covert operations beyond its borders, including several during the Gaza war that it only acknowledged later.
The activists said the strike appeared to target the boat's generator.
Following the distress call, the Malta Vessel Traffic Services body dispatched a tugboat and offered support.
"The tug arrived on scene and began firefighting operations. By 0128 hrs, the fire was reported under control," the Maltese statement said.
- 'Desperately needed aid' -
A Cypriot-owned vessel also responded to the distress call.
"The Larnaca Joint Rescue Coordination Centre (JRCC) has been informed by the Ministry of Foreign Affairs of the Republic of Cyprus that a vessel possibly transporting humanitarian aid to Gaza came under missile attack by an Israeli Unmanned Aerial Vehicle (UAV) while sailing within the Search and Rescue (SAR) Region of Malta," the Cypriot rescue body said.
It said a Cypriot-owned vessel in the area "participated in firefighting operations".
The activists were on what they called a "mission to challenge Israel's illegal and deadly siege of Gaza, and to deliver desperately needed, life-saving aid".
Israel has since March 2 blocked all aid deliveries to Gaza, and resumed major military operations in the territory in mid-March, ending a two-month ceasefire.
The International Committee of the Red Cross warned Friday that the humanitarian response in Gaza was on the "verge of total collapse" after two months of aid being blocked.
Türkiye, which said it had nationals on board the vessel, strongly condemned "this attack on a civilian ship, which threatens freedom of navigation and maritime security in international waters".
"There are allegations that the ship was targeted by Israeli drones. All necessary initiatives will be taken to reveal the details of the attack as soon as possible and to hold the perpetrators accountable," a foreign ministry statement said.
A previous "Freedom Flotilla" sailed from southern Türkiye in 2010 but ended in bloodshed when Israeli forces stormed the Mavi Marmara vessel, killing 10 people and wounding 28.
Hamas's attack on Israel in October 2023, which sparked the Gaza war, resulted in the deaths of 1,218 people, mostly civilians, according to an AFP tally based on official figures.
The health ministry in Hamas-run Gaza said on Thursday that at least 2,326 people have been killed since Israel resumed strikes, bringing the overall death toll since the war broke out to 52,418.
Both Hamas and the Palestine Liberation Organization, which Palestinian President Mahmoud Abbas leads, issued statements condemning the disabling of the aid ship off Malta.
Hamas said it showed Israel's "blatant disregard for the will of humanity and justice".
