Iraqi officials say two people were injured when bodyguards for Iraq's deputy prime minister fired warning shots at protesters who attacked his convoy.
Salih al-Mutlaq had travelled to the city of Ramadi, in Iraq's Sunni-dominated Anbar Province, to address locals when antigovernment demonstrators pelted his convoy with bottles and stones.
The two injured were taken to hospital.
Mutlaq, himself a Sunni, had hoped to ease tensions after a week of protests by Sunnis over their perceived second-class treatment by the Shi'ite-led government.
Anbar provincial council member Talib Hamadi al-Dulaimi said a dispute broke out and shots were fired after protesters insisted Mutlaq show support for their demonstration by submitting his resignation from the government.
Mutlaq was driven from the scene by his bodyguards.
Based on reporting by Reuters and AP