One civilian was killed and three policemen injured after unknown assailants attacked a checkpoint in Egypt's Greater Cairo’s Mohandeseen district late Sunday, health ministry spokesperson Hossam Abdel-Ghafar told Ahram Online.

Abdel-Ghafar said that the civilian who was killed has yet to be identified.

The masked assailants fired shots from their vehicle when going through El-Awqaf checkpoint located on major thoroughfare, Gameat El-Dowal El-Arabia Street, Al-Ahram’s Arabic news website reported.

Egypt’s prosecution went early Monday to examine the crime scene, ordering the forensic authority to examine the body of the unidentified civilian.

The prosecution is also investigating two suspects who were arrested near the incident late Sunday.

The interior ministry is working with the armed forces to tighten security measures throughout the country ahead of Coptic Christmas celebrations amid fears of security threats.

Earlier this week, authorities defused a bomb also in Giza governorate, with no injuries reported.

Bombing attempts have become frequent following the ouster of Islamist president Mohamed Morsi in July 2013 amid nationwide mass protests against his rule. The state has since sustained a crackdown on Morsi’s supporters with mass arrests and the often-violent dispersal of demonstrations.