Cairo bomb explosion injures five civilians

A bomb planted on a pedestrian island has injured at least five passengers on a public bus in Cairo, Egypt, the health ministry said.

The explosion occurred in the northern district of Nasr City.

So far no deaths have been reported.

A security source also said that explosive experts detonated a second bomb planted in an advertising board close to the first explosion.

The attack comes a day after the military-backed interim Egyptian government declared the Muslim Brotherhood a terrorist group after blaming it for a deadly attack on a police HQ earlier this week.

The group, whose candidate Mohammed Morsi won the presidential poll last year before being deposed by the military, had already been outlawed. Thousands of its supporters have also been arrested in a crackdown.

In recent months, Egypt has seen a wave of attacks that the authorities have blamed on Islamist militants.

On Tuesday, 16 people were killed and more than 100 were injured in a car bomb attack on a security building in the northern city of Mansoura.

The government blamed the Muslim Brotherhood for the attack - a charge the movement denied.

An al-Qaeda-inspired militant group Ansar Beit al-Maqdis (Champions of Jerusalem) claimed responsibility.