Israel asked the United Nations to stop a Swedish-owned ship carrying human rights activists from attempting to break Israel's naval blockade of Gaza.
Turkey said on Thursday it would escort aid ships to Gaza and would not allow a repetition of last year's Israeli raid that killed nine Turks, setting the stage for a potential naval confrontation with its former ally.
Israel's Navy intercepted a French ship heading for Gaza, the only member of the pro-Palestinian flotilla to make it to the blockaded waters.
The first wave of Palestinian protesters who hoped to fly into Ben Gurion International Airport were mostly prevented from boarding planes in European airports.
The Canadian ship "Tahrir", participating in the flotilla to Gaza, attempted to depart Monday from the Greek port of Piraeus, but was intercepted by the Greek coast guard shortly after departure.
All operational ships slated to participate in the Gaza-bond flotilla will depart on Monday, organizers said.