The International Criminal Court prosecutor says Israeli forces may have committed war crimes when they stormed an aid flotilla boat heading to Gaza in 2010, but that the possible crimes are not grave enough to merit a prosecution.

Fatou Bensouda says in a statement Thursday that any cases relating to the storming "would not be of sufficient gravity to justify further action by the ICC."

Eight Turks and one Turkish-American were killed and several other pro-Palestinian activists were wounded when Israeli commandos stormed the ship Mavi Marmara on May 31, 2010.

Bensouda opened a preliminary investigation last year after the tiny African state of Comoros — which is a member of the court — filed a complaint about the boarding of the ship which was flying under a Comoros flag.