U.N. Secretary-General Javier Perez de Cuellar said Friday he will not send envoys to investigate the killing of at least 19 Palestinians in Jerusalem unless Israel decides to cooperate.

But he gave the United States and other countries more time to try to reverse opposition by the Israeli government, which says that allowing the U.N. team in would call into question Israel's sovereignty over the city.At least 19 Palestinians died Oct. 8 when Israeli security forces fired on protesters throwing rocks on Jews praying at the Wailing Wall.

"I cannot send the mission if I am not persuaded that the mission will not get all the necessary facilities in order to complete their mission, their job," said Perez de Cuellar.

But he added: "I am always prepared to send the mission if the mission is given the facilities they need to present an independent report."

Perez de Cuellar said he is not pursuing further efforts to win Israeli cooperation but noted he believes "some countries would like to exert some influence on the Israelis so that they end up by accepting the mission."

On Thursday, Israeli Ambassador Johanan Bein said his government will "cooperate in trying to find ways and means to facilitate the secretary-general to write his report, and present it."

The U.N. chief said the Israeli government has offered a copy of Israel's official inquest when it is completed.