Gunmen on Monday killed three policemen in Egypt, where attacks against security forces have been on the rise in the face of a bloody crackdown against Islamists, security officials said.

The assailants opened fire on the policemen who were posted near the University of Mansura in Egypt's Nile Delta region, before fleeing, one source said.

Since the army's ouster of the country's first freely elected president, Islamist Mohammad Mursi, near-daily attacks targeting security forces have left dozens dead, particularly in the lawless Sinai peninsula.

The interim government installed by the army accuses pro-Mursi Islamist groups of being behind the attacks.

Jihadist movements have claimed many of the attacks, slamming what they call a brutal military coup and have demanded Mursi’s return to power.

Since August 14, when policemen and soldiers killed hundreds of pro-Mursi demonstrators in Cairo as they dispersed two huge protest camps, over 1,000 have died in the crackdown.

More than 2,000 members and supporters of Mursi’s Muslim Brotherhood have also been arrested since August, including Mursi and its top leadership, who will face trial for inciting the killing of protesters.