Updated

ANKARA, Turkey -- Turkish police blocked dozens of stone-throwing protesters who tried to storm the Israeli Consulate in Istanbul over reports of an Israeli attack on at least one aid ship in international waters on Monday, news channels reported.

CNN-Turk and NTV showed dozens of angry protesters scuffling with Turkish police guarding the consulate in downtown Istanbul.

"Damn Israel," the protesters shouted.

The Israeli military denied that its forces attacked the boats but said they would enforce the decision to keep them away from Gaza.

Two TV networks reported earlier that Israeli warships attacked the six ships carrying pro-Palestinian activists and aid for blockaded Gaza, killing at least two and wounding an unknown number of people on board.

"We were not expecting such an operation in international waters," Omer Faruk Korkmaz, an official of the pro-Islamic aid group, IHH, that led the aid shipment said in Turkey. "Israel has been caught redhanded and the international community will not forgive it."

Korkmaz said the ship was being escorted to Haifa.

Turkey summoned the Israeli ambassador to the foreign ministry to discuss the incident, which heightened tensions between Turkey and Israel to new levels.