IS-Linked Group Claims Cairo Bombing

Egyptians gather outside of a national security building after a bomb exploded in the Shubra el-Kheima neighborhood of Cairo injuring several people according to security officials, early  Aug. 20, 2015.

An Egyptian plainclothes policeman stands in the damaged national security building after a bomb exploded in the Shubra el-Kheima neighborhood of Cairo, injuring several people according to Egyptian security officials, early Aug. 20, 2015.

An Egyptian woman walks near the damaged national security building after a bomb exploded early in the Shubra el-Kheima neighborhood of Cairo, Aug. 20, 2015.

A wounded man arrives at a hospital after a bomb exploded near a national security building in the Shubra el-Kheima neighborhood of Cairo, Aug. 20, 2015.

This photo shows a damaged vehicle after a bomb exploded near a national security building in the Shubra el-Kheima neighborhood of Cairo, Aug. 20, 2015.

Egyptians examine an engine believed to be from the car that was used in the bombing of the national security building in the Shubra el-Kheima neighborhood of Cairo, Aug. 20, 2015.

A security official guards the site of a bomb blast at a state security building in Shubra Al-Khaima, on the outskirts of Cairo, Aug. 20, 2015.