Attacks on three army checkpoints in North Sinai’s Rafah near the border with Gaza have left six soldiers injured, but no deaths, a medical source told Al-Ahram’s Arabic news website.

The attack, according to a security official who spoke with Al-Ahram, was carried out by rocket-propelled grenades (RPGs).  The injuries were caused by shrapnel from the explosions.

The Sinai has witnessed a security vacuum since Egypt's 2011 revolution, and attacks by alleged Islamist assailants are regularly reported.

After the army’s removal of former president Mohamed Morsi following mass protests against him, attacks in North Sinai have spiked, leading to over a dozen deaths.

On Monday, at least three people were killed and 17 wounded in North Sinai's Al-Arish city when suspected militants fired RPGs at a bus carrying cement factory workers.

The army said that the real target of the attack was a nearby police vehicle.

On Tuesday night, another attack using mobile anti-aircraft rockets and machine guns took place in Rafah, wounding two officers, Reuters reported.

On Tuesday, Israel allowed Egypt to deploy two army battalions in the Sinai in order to fight militants carrying out the attacks. Egypt must have Israel's permission to send additional troops into the Sinai in accordance with the Camp David treaty signed between Israel and Egypt in 1979.

The Camp David Accords came under public scrutiny after the 2011 revolution, when the Egyptian government was accused of not having full sovereignty over the Sinai due to the treaty. Egyptian leaders following ousted president Hosni Mubarak – who safeguarded the treaty during his 30 year term – have vowed to uphold the treaty despite demands to amend it.