So far, 3 ships were found to be damaged. Probabilistically, this is an unusually high number, so we can count on intended sabotage. Of course, nobody was caught causing the damage, so we have to ask "who benefits from this"? Usual investigative "tools" but so far not sufficient for an indictment.
UN: Satellite images show Temple of Bel in Syria 'destroyed' (AP)
from the article: Greece arrests captain of U.S. ship in Gaza flotilla