- 15 updates
Security has been tightened in Cairo's central Tahrir Square as Egyptians prepare to commemorate the third anniversary of the uprising that toppled former President Hosni Mubarak.
Security forces have blockaded the roads leading to the square, which remains closed to the public.
During the 2011 uprising, Tahrir Square was at the centre of the anti-government protests and the violent clashes that ensued.
An al-Qaeda-inspired group in Egypt has claimed responsibility for a wave of attacks in Cairo that killed six people on Friday, according to a US-based monitoring service.
The SITE monitoring service said the militant group Ansar Bayt al-Maqdis (Supporters of Jerusalem) made the claim in a message placed on Jihad forums on Friday.
It said it carried out attacks including a car bomb at a security compound in central Cairo, and told Muslims to stay away from "enemy headquarters and security centres".
Pictures are emerging from a bomb explosion near a police academy in Cairo, on the third anniversary of the revolution.
A reporter from Egyptian radio Sawa has posted images from the aftermath, in which person is reported to have been injured.
A bomb exploded near a police academy in Cairo on Saturday, wounding one person, security sources told Reuters.
The explosion, which occurred on the third anniversary of the uprising that toppled autocrat Hosni Mubarak, came a day after a wave of bomb attacks targeting police killed six people and raised fears that an Islamic insurgency is gaining momentum.
Islamist militants have stepped up attacks since the army toppled President Mohamed Morsi of the Muslim Brotherhood in July. Hundreds of security forces have been killed.
Egypt is on high alert after a wave of bomb attacks targeting police hit Cairo on Friday, killing at least 18 people.
It comes on the eve of the third anniversary of the uprising that toppled former president Hosni Mubarak, raising fears that an Islamist insurgency is gaining pace in Egypt.
Authorities have been bracing for more violence as rival political groups are expected to turn out, including supporters of army chief General Abdel Fattah al-Sisi, members of the Muslim Brotherhood and liberals.
The 2011 revolt raised hopes of a stable democracy in the Arab world's largest nation. Instead, relentless political turmoil has hit investment and tourism hard in Egypt.