Israel Defense Forces: 'Terrorists have violated the cease-fire'

Gaza City (CNN) -- Rockets from Gaza hit Israel early Friday morning, breaking the cease-fire, according to the Israel Defense Forces.

"Moments ago, 2 rockets fired from Gaza hit southern Israel. Terrorists have violated the cease-fire," the IDF wrote on Twitter.

It wasn't immediately clear how Israel would respond.

Earlier, negotiators in Cairo had been scrambling to extend the Gaza cease-fire. A Hamas official had told supporters in Gaza City that the group was ready to resume fighting if it didn't win key concessions in the talks.

"We are ready to return to the battle if the Palestinian demands are not met in Cairo," Hamas spokesman Mosher al-Masry told a crowd of supporters waving the group's green flags.

A spokesman for Hamas' military wing, the Al-Qassam Brigades, was even more pointed.

"We demand from the negotiating team to pull out from negotiations if the enemy continues to be stubborn; we are ready for a long war," Abu Obaida said on Hamas-run Al-Aqsa television.

"We demand that the negotiating team not extend negotiations without the agreement on a seaport," he said, demanding that the blockade against Gaza be lifted, and all the crossings into Egypt and Israel be opened.

"We will not accept anything less," the spokesman said. "We will make the tanks of the enemy a toy in the hands of the children of Gaza."

The cease-fire that has ended the bloodshed -- at least temporarily -- was set to expire at 8 a.m. Friday (1 a.m. ET).

As the spokesman suggested, Hamas wants Israel to end border restrictions that limit the flow of people and goods into and out of Gaza. Israel wants Hamas to give up its weapons.

Israel, which withdrew its ground forces from Gaza on Tuesday, is willing to extend the truce unconditionally, Dore Gold, a senior foreign policy adviser to Israeli Prime Minister Benjamin Netanyahu, told CNN on Thursday.