Activists aboard the 'Madleen' flotilla to Gaza, sailing to the Strip with the aim of "breaking the Israeli blockade," claimed that an Israeli vessel came to stop them - but minutes later wrote that it had left and it was a "false alarm." Earlier they posted: "An alarm was heard on deck, and life jackets are ready for vessel interception." One activist posted an Instagram video titled: "We're being attacked!" Another added: "They're catching us now, we have no weapons."