The Foreign Ministry says Jerusalem sent a message earlier this week, but it didn't say what action would be taken against the Finnish-flagged Estelle. Ministry spokesman Risto Piipponen said Saturday that Finland urged Israel for restraint, because it was a non-military vessel with civilians on board. It left Naples, Italy, on Oct. 7 with about 20 people on board.

Israel imposed a blockade on Gaza after the militant Islamic Hamas seized control of it in 2007 from secular rival Fatah.