Egyptian security officials say a pipeline carrying gas to Israel and Jordan was hit by two explosions early Thursday — the sixth such attack this year.

The officials say the first blast occurred near the northern Sinai town of al-Arish. A second explosion took place near a pumping station in the same sector.

Witnesses said they had seen armed men at the scene of the first blast and that flames could be seen from the town.

The pipeline has been a frequent target for attacks by unidentified men since the overthrow of President Hosni Mubarak in February.

Egypt and Israel signed a gas deal during Mr. Mubarak's presidency, under which Egypt would export gas to its northern neighbor. However, the deal was unpopular with the Egyptian public.