At least three gunmen in a van opened fire on a gas installation before an explosion hit the pipeline near the town of Al-Arish in the north of the Sinai peninsula, witnesses said.
It was the sixth such attack on the pipeline since Egypt’s former president Hosni Mubarak was toppled in February. It carries gas through the Sinai and on to Jordan and Israel.
Three people were injured in the attack.
Egypt supplies 43 percent of Israel’s natural gas and 40 percent of Israel’s electricity comes from this source.
The latest blast comes against a background of rising tension between Egypt and Israel.
The new regime in Cairo is in the process of reviewing all its gas contracts with Israel signed under Mubarak.