Five people were hurt Thursday when a bomb went off near a bus in Cairo's Nasr City neighborhood, authorities said, while an Egyptian security source told Efe that two more explosive devices were found in the vicinity and disarmed.
The intended target was a police complex on Mustafa Nahas Ave., state television said, though the blast was also not far from Al Azhar University, the academic center of Sunni Islam.
The five bus passengers wounded in the explosion were taken to the main hospital in Nasr City, the Health Ministry said.
Mustafa Nahas Ave. was the scene in September of a car-bomb attack targeting Interior Minister Mohamed Ibrahim, who escaped unharmed.
The bus bombing came a day after Egypt's Cabinet declared the Muslim Brotherhood, which was in power until a July 3 military coup, a terrorist group.
The declaration followed a suicide attack early Tuesday on a police station in the Nile Delta city of Mansoura that the military-backed interim government says killed 16.
The government attributed the attack to the Muslim Brotherhood, despite the group's condemnation of the strike - and despite a claim of responsibility from the Al Qaeda-inspired Ansar Beit Al-Maqdis faction.
Wednesday's government edict outlaws all of the Muslim Brotherhood's activities and any funding of the organization.
The Brotherhood and its allies have held demonstrations at universities across Egypt since Islamist President Mohamed Morsi was deposed by the armed forces following days of massive anti-government protests.
While in office from June 2012 to July 2013, Morsi and the Brotherhood were accused of doing little to address poverty and Egypt's struggling economy, of failing to advance the goals of the 2011 revolution that forced out strongman Hosni Mubarak and of seeking to monopolize power. EFE