"Next fall we shall pray in Ramallah," senior Hamas official Nizar Riyan told a rally in Gaza, where Hamas gained control after ousting Fatah last June, The Jerusalem Post reported.
In response, a senior member of the Palestine Liberation Organization predicted Hamas would fail. Riyan "should be admitted to a mental institution," Yasser Abed Rabbo told the Post.
Meanwhile, Israeli military officials said Hamas was digging tunnels near the border with Israel, building a bunker system and amassing an unprecedented amount of weapons and bomb-making materials, the Post reported.
"They are trying to build this up and we are trying to stop them," said Yuval Diskin, the head of Shin Bet, Israel's security agency.