NETANYA, Israel?A suicide bomber burst into a hotel dining room and blew himself up Wednesday just as Israelis dressed in their holiday best were sitting down to a Seder meal celebrating the Jewish Passover. At least 15 people were killed and more than 100 were wounded.

The explosion tore through the ground floor of the Park Hotel in this northern coastal resort, blowing out walls and windows and overturning tables and chairs. Bits of rubble and wires dangled from the ceiling. In the chaos, one table remained standing, covered by a white cloth and with the elaborate Seder place settings still in place. The Islamic militant group Hamas claimed responsibility for what Israeli government spokesman Gideon Meir called a “Passover massacre.”

The bombing in Netanya threatened to derail the latest U.S. truce mission, just hours after President Bush said his envoy to the region had made some progress.