A man walks near debris after an explosion near a security building in Egypt's Nile Delta town of Dakahlyia

A damaged area is seen after an explosion at a security building in Mansoura city, the capital of Dakahlyia Governorate

People stand on a damaged vehicle after an explosion at a security building in Mansoura city, the capital of Dakahlyia Governorate

Egyptians gather after a powerful explosion believed to be caused by a car bomb rocked a police headquarters in the Nile Delta city of Mansoura,

The building of the Directorate of Security is pictured after an explosion in Egypt's Nile Delta town of Dakahlyia

A riot police officer gestures outside the building of the Directorate of Security after an explosion in Egypt's Nile Delta town of Dakahlyia

Police officers stand near damaged vehicles outside the building of Directorate of Security after an explosion in Egypt's Nile Delta town of Dakahlyia

The building of the Directorate of Security is pictured after an explosion in Egypt's Nile Delta town of Dakahlyia

A riot police officer gestures outside the building of the Directorate of Security after an explosion in Egypt's Nile Delta town of Dakahlyia

Police officers investigate the site of a bomb attack near the Building of the Directorate of Security in Egypt's Nile Delta town of Dakahlyia

The damage is seen outside the building of the Directorate of Security after an explosion in Egypt's Nile Delta town of Dakahlyia

A police officer inspects the site of a bomb attack in front of the building of the Directorate of Security in Egypt's Nile Delta town of Dakahlyia

Surrounded by security officials, journalists and rescue workers, Egypt's Interior Minister Mohammed Ibrahim, center with gray hair, tours the site of an explosion at a police headquarters building

A man walks near debris after an explosion near a security building in Egypt's Nile Delta city of Mansoura in Dakahlyia

People look at the damage after an explosion near a security building in Egypt's Nile Delta city of Mansoura in Dakahlyia

A damaged car is seen after an explosion near a security building in Egypt's Nile Delta city of Mansoura in Dakahlyia

Egyptian gather at the scene of an explosion at a police headquarters building that killed at least a dozen people, wounded more than 100

Egyptian security and rescue officials inspect the scene of an explosion at a police headquarters building

Egyptian policemen inspect the scene of an explosion at a police headquarters building