Three men were arrested in Ireland on Wednesday night at a demonstration in Dublin during a visit by Iranian foreign minister Manouchehr Mottaki.
During an address to the Institute of International and European Affairs Mr Mottaki was heckled by two protesters.
About 25 protesters gathered outside in protest against the visit by Mr Mottaki who was pelted with eggs as he left.
Irish police said three men in their early to mid-30s were detained on suspicion of public order offences.
One demonstrator, who said he was Iranian, was reportedly punched and kicked by the minister's bodyguards.
Television footage showed him being pushed down the stairs of the building in North Great Georges Street.
Another protester was also dragged from the building by the security guards.
Bodyguards used an umbrella to protect the Iranian minister. Minor scuffles broke out as the protesters thumped and kicked a car taking Mr Mottaki from the scene at about 1930 BST.
According to the Institute of International and European Affairs the event was organised as an "opportunity for an Irish audience to hear first hand the foreign policy intentions of the government of the Islamic Republic".