Greek protesters at Acropolis raided by police

Protesters barricaded themselves inside the Acropolis and padlocked the entrance gates, disallowing tourists to enter the ancient monument. They said they intended to keep up the blockade until 31 October, and vowed to return to the site on Friday.

Greece has seen waves of strikes and protests over austerity measures agreed by the government in order to secure a huge bail-out from eurozone countries.

Greek workers are also angered by the possible expiration of their contracts at the end of the month, where around 320 temporary staff will lose their jobs.

One of the leaders of the striking workers said on television "All our colleagues stand beside us, so the monument will not operate today no matter what happens.”

"We want the ministry to cancel the planned dismissal of 320 staffers and settle its dues to people who have been unpaid for 22 months," he said.

Despite the protests, police arrived on site this morning after a court order said the protesters were hindering access to an ancient site.

TV footage showed the police entering the site using a side entrance.

They used tear gas to clear protesters and a group of journalists who had gathered at the main gate. At least one person was arrested.

Deputy Culture Minister Telemachos Hytiris offered to talk to the protesters but said he could not promise them permanent contracts.

"Thousands of short-term workers have been laid off until now, the law applies to all," he said in radio comments.

Latest figures show unemployment in Greece is at 12%, with those aged under 24 are worst affected.