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PHOTO GALLERY: Explosion at police building in Shubra El-Kheima heard across Greater Cairo




People stand near the site of a bomb blast at a national security building in Shubra El-Kheima on the outskirts of Cairo, Egypt 20 August 2015 (Reuters)

Egyptians gather outside of a national security building after a bomb exploded early Thursday, Aug. 20, 2015, in the Shubra el-Kheima neighborhood of Cairo, Egypt (AP)

A policeman moves a barricade after a bomb exploded early Thursday, Aug. 20, 2015, near a national security building in the Shubra el-Kheima neighborhood of Cairo, Egypt (AP)

Debris is seen on the ground after a bomb blast at a national security building in Shubra Al-Khaima on the outskirts of Cairo, Egypt August 20, 2015 (Reuters)

People protest against the crime after a bomb blast at a national security building in Shubra Al-Khaima on the outskirts of Cairo, Egypt August 20, 2015 (Reuters)

An Egyptian worker checks a hole believed to be caused by the bombing in the street outside the national security building early Thursday, Aug. 20, 2015, in the Shubra el-Kheima neighborhood of Cairo, Egypt (AP)

Security officials stand guard at the site of a bomb blast at a national security building in Shubra El-Kheima, on the outskirts of Cairo, Egypt 20 August 2015 (Reuters)

A security official gestures as a damaged building is seen behind him after a bomb blast hit a national security building in Shubra El-Kheima on the outskirts of Cairo, Egypt 20 August 2015 (Reuters)

People gather outside an Egyptian national security building after a bomb exploded early Thursday, 20 August 2015, in the Shubra El-Kheima neighbourhood of Cairo (AP)

People gather after a bomb exploded early Thursday, 20 August 2015, near a national security building in the Shubra neighbourhood of Cairo (AP)

An Egyptian policeman stands outside of a national security building after a bomb exploded early Thursday, 20 August 2015 in the Shubra El-Kheima neighbourhood of Cairo (AP)

Security officials stand at the site of a bomb blast at a national security building in Shubra El-Kheima on the outskirts of Cairo, Egypt 20 August 2015 (Reuters)

Debris seen on the ground near a damaged building after a bomb blast at a national security building in Shubra El-Kheima on the outskirts of Cairo, Egypt 20 August 2015 (Reuters)

A damaged car is seen at the site of a bomb blast at a national security building in Shubra El-Khaima on the outskirts of Cairo, Egypt 20 August 2015 (Reuters)

Debris (R) seen on the ground after a bomb blast at a national security building in Shubra El-Kheima on the outskirts of Cairo, Egypt 20 August 2015 (Reuters)