Egypt's interior ministry says gunmen kill high-ranking national security officer in Cairo

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Egypt's interior ministry says unknown gunmen have shot and killed a senior national security officer in Cairo as he headed to his office.

The statement from the ministry said gunmen opened fire on a car carrying Lt. Col. Mohammed Mabrouk of the national security agency, killing him on the spot late Sunday. Mabrouk worked in the agency's branch in charge of monitoring Islamist groups, including the Muslim Brotherhood.

Mabrouk is one of the most senior security officers to be targeted and killed in Cairo during the violence that has gripped Egypt since the ouster of Islamist President Mohammed Morsi in July.

A security official said Mabrouk was hit by seven bullets in his chest and head fired by gunmen whom witnesses described as masked. The official spoke on condition of anonymity because he was not authorized to speak to reporters.