ATHENS, Greece — Activists in a flotilla seeking to break Israel’s blockade of Gaza said Wednesday that some of their boats were attacked by drones south of Greece, prompting Spain and Italy to send navy vessels for possible rescues.

The Global Sumud Flotilla said it was attacked during the night by “unidentified drones and communications jamming.” It said that “at least 13 explosions” were heard on and around several flotilla boats, while drones or aircraft dropped “unidentified objects” on at least 10 boats.

No casualties were reported but there was damage to the vessels and “widespread obstruction in communications,” it added. Activists posted a brief video showing what appeared to be an explosion on or near one of the vessels. Greece’s coast guard did not report any distress calls.

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