Hamas's top political chief says his movement will not accept Israel's demands for a cease-fire and insists the siege on Gaza must be lifted before Hamas will halt rocket attacks. Khaled Mashaal has asked a gathering of Arab leaders in the Qatari capital on Friday to back Hamas in its demands, to announce a boycott of Israel and cut off any ties with the Jewish state. Mashaal says Hamas is sticking by its demands that a border openings into the Gaza Strip must be opened immediately before it will stop rocket attacks. He says Hamas "will not accept Israel's conditions" for a cease-fire. Israel has demanded a total halt to Hamas rockets and guarantees Hamas cannot rearm.