Security forces in Egypt's North Sinai discovered an explosive placed near the Al-Zakhrafia school in the city of Al-Arish on Sunday.
A security source said that they were informed of the presence of "a strange device in the vicinity of the school," which was later defused and taken to a safe place for disposal, the state-owned news agency MENA reported.
Egypt has witnessed three explosions on the course of the past week.
A bomb rocked the Security Directorate building in the Nile Delta city of Mansoura on Tuesday, killing 16 people and injuring more than 135.
On Sunday, four soldiers were injured in an explosion near the Sharqiya Governorate's Military Intelligence Headquarters, while on Thursday a smaller explosion near a public bus in eastern Cairo's Nasr City injured five people.
Explosives experts also defused a bomb near the Nasr City explosion site, which reportedly targeted security forces expected to rush to the scene following the blast.
On Saturday, the discovery of a dummy bomb in Alexandria University caused a stir on campus among students and professors. Experts who examined the bomb found it to be devoid of explosive material.
Militant attacks have spiked since the July ouster of Islamist president Mohamed Morsi. While initially centred in Egypt's restive Sinai Peninsula, the attacks have recently extended to additional governorates.