Israel's navy will stop a flotilla heading for Gaza with 10,000 tons of supplies and pro-Palestinian activists intent on breaking a three-year blockade of Gaza, officials said Wednesday, in the first definitive Israeli pledge to stop the boats.

The officials said if the flotilla of eight ships does not turn back, the boats will be hauled to an Israeli port, the activists sent back to their countries and the supplies transferred to Gaza by land.

Israeli Prime Minister Benjamin Netanyahu left for Paris on Thursday on a trip that will also take him to Washington after he received a last-minute invitation for talks with U.S. President Barack Obama.

In Paris, Netanyahu will formally accept an invitation for Israel to join the Organization for Economic Cooperation and Development, a Paris-based group of 30 developed world nations.

Speaker Nabih Berri snapped back at critics of the Hizbullah-Amal alliance who have accused "the Shiite couple" of launching war on families in last Sunday's municipal elections in the south and Nabatiyeh.

"Don't our candidates come from families?" Berri asked An Nahar newspaper.