Police officials say 11 others were wounded in the Saturday morning blast in the capital's Qahira neighborhood. Shops and cars were damaged.
Health officials confirmed the casualty figures. All officials spoke on condition of anonymity because they were not authorized to release the information to reporters.
Violence escalated sharply in late April following a deadly crackdown by security forces on a camp for Sunni protesters in the northern town of Hawija. At least 365 people have died in attacks so far this month, according to an Associated Press count.
Press; By SAMEER N. YACOUB]
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