A suicide bomber dressed in a woman's robe detonated explosives Sunday in a heavily guarded Sunni area of Baghdad, killing the deputy leader of the neighborhood's US-backed security volunteers who had turned against al-Qaida, Iraqi officials said. Six bodyguards of Farooq al-Obeidi, deputy leader of the "awakening council" in Baghdad's Azamiyah district, also died in the blast, which occurred as they were seated on chairs near a checkpoint near the Abu Hanifa mosque in the former insurgent stronghold, police and Iraqi army officials said. The assailant, wearing a black abaya robe, walked up to al-Obeidi's party and detonated the explosives, the officials said on condition of anonymity because they were not supposed to talk to media. Some of the officials said the attacker was a woman. But one of them said the attacker was a man who probably wore the flowing garment to conceal the explosives.