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But Mr. Abbas disputed Israel‘s allegations that Palestinian clerics preach incitement, saying his government hands out a uniform sermon to be delivered by all. He also called for a joint Israeli-Palestinian-U.S. team to examine claims of incitement in Palestinian textbooks.

Israel long has contended that Palestinian textbooks and official media preach hatred toward Israel and that the killers of Israelis are often glorified.

On Sunday, a group of activists from Mr. Abbas’ Fatah movement dedicated a square in the West Bank city of Ramallah after Dalal Mughrabi, a female militant who carried out a 1978 bus attack that killed 37 Israelis. Aides to Mr. Abbas said they tried to stop the ceremony and the move was not officially sanctioned.

Still, Israel has not produced evidence that incitement contributed to the killings.

The military has taken some 20 people into custody in connection with the attacks but has provided no further details. Mr. Abbas said Palestinian security officials were working with Israel to find the assailant.