Read the article again, because that's not what it says. Opening the probe means they did not reject jurisdiction out of hand. It does not mean that they accept jurisdiction, a hurdle which must still be passed by the plaintiffs in this initial stage. Accepting and not rejecting are two very different things in the legal world.
Man shot dead in northern Israel town of Bi'ina, police say the murder was gang related (Haaretz)
from the article: The Hague weighs criminal probe of Israel over 2010 Marmara raid