Bomb wounds four Egyptian policemen, civilian

A general view of Cairo's skyline is seen at sunset on July 13, 2013. By Gianluigi Guercia (AFP/File)

Cairo (AFP) - A bomb in Cairo wounded four policemen and a civilian Friday, officials said.

It was the second in the capital in as many days, after an explosion wounded a police officer late Thursday outside the Al-Qubba presidential palace.

The bomb exploded in the Alf Maskan district, where the injured policemen were stationed to confront expected protests by Islamist opposition activists.

A civilian was also wounded, state news agency MENA said quoting the health ministry.

The blast came ahead of Sunday's fourth anniversary of the outbreak of an 18-day uprising that drove former president Hosni Mubarak from power 2011.

Egypt has been rocked by a wave of bombings and shootings since former army chief and now President Abdel Fattah al-Sisi ousted Mubarak's successor, Islamist Mohamed Morsi, in 2013.

Jihadists have mostly targeted policemen and soldiers in retaliation for a government crackdown against Morsi's supporters that has left hundreds dead since his overthrow.