Egyptian security officials say a mortar shell fired by militants hit a home in the restive northern Sinai town of Sheikh Zuweid, killing an elderly man and wounding his son.

In a separate incident in Sheikh Zuweid, the officials said three 7-year-old boys were severely wounded Sunday when a land mine exploded. The officials blamed local militants for planting the mine.

They spoke on condition of anonymity because they are not authorized to brief journalists.

Egypt is battling an insurgency, including an affiliate of the Islamic State group, which has largely targeted troops in the northern Sinai Peninsula since the 2013 military overthrow of the Islamist President Mohamed Morsi. The militants say they are avenging a government crackdown on his supporters. The Sinai Peninsula is mostly off limits to media.