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BBC Clashes in Athens as Rice visits
TV pictures showed the air thick with teargas
Athens police have fired teargas during a clash with anti-war demonstrators protesting against a visit by US Secretary of State Condoleezza Rice.
Some protesters hurled petrol bombs, sticks and stones in return.
Ms Rice is meeting Greek Prime Minister Costas Karamanlis as part of a five-day trip to Europe that also includes Turkey and Bulgaria.
Thousands of protesters are said to have gathered in Athens. Some 5,000 riot police have been deployed.
Television pictures showed protesters throwing petrol bombs and using sticks as riot police advanced, the air thick with tear gas.
The protesters were trying to reach the buildings where Condoleezza Rice is meeting Mr Karamanlis and her Greek counterpart, Foreign Minister Dora Bakoyianni, but many retreated under the police pressure, reports said.
Self-styled anarchists trailing the demonstrators continued fighting police, burning cars and smashing shop fronts, Reuters news agency reported, but there were no reports of injuries or arrests.
Police helicopters circled the city centre.
'War-mongering'
"We are not protesting just against Rice, but the imperialist, war-mongering US government," school teacher Panayiotis Hiundis told Reuters.
A senior figure from Greece's Communist Party accused Ms Rice of using the one-day visit to drum up support for an offensive against Iran, which the US accuses of trying to build a nuclear bomb.
At least six people were detained on Monday after they managed to unfurl a giant banner reading "Condoleezza Rice go home" on the Athens concert hall, adjacent to the US embassy, the AP news agency reported.
The US war in Iraq has triggered strong opposition in Greece. In addition, say commentators, many Greeks are still bitter at Washington for backing the right-wing military junta which ruled Greece between 1967 and 1974.
Ms Rice told reporters accompanying her to Europe that she would discuss Balkan peacekeeping, the future of the divided island of Cyprus, and the threat of terrorist attacks along the Turkey-Iraq border.
But in her first reported public statements from Athens, Ms Rice said Iran was isolating itself from the international community by threatening to suspend co-operation with the UN nuclear watchdog, the IAEA, if sanctions are imposed.
She will leave for Ankara on Tuesday evening.
The date of Ms Rice's visit was changed to try to circumvent huge rallies against the wars in Iraq and Afghanistan which were planned to coincide with it.
Noisy anti-war protests marked a visit by Ms Rice to the north-west of the UK at the beginning of April.