Tehran, July 28 (DPA) Iran's supreme leader Ayatollah Ali Khamenei has ordered the closure of a prison in southern Tehran, state media reported Tuesday amid concerns about the fate of protesters arrested in the wake of last month's disputed presidential election.

Parliament deputy Kazem Jalali told the Mehr news agency that the leader ordered the Kahrizak detention centre shut down because it lacked the necessary standards for preserving detainees' rights.

Kahrizak is said to be the main place where the election protesters were held and where some of them also died in mysterious ways.

According to official statistics, more than 1,000 people were arrested in protests over election fraud alleged by the opposition in the June 12 vote, and of those, at least 20 have been killed and 300 are still in jail.

In the meantime, not only the reformist opposition, led by presidential candidate Mir-Hossein Moussavi, but also conservative circles and parliament deputies have voiced concerns over the fate of the prisoners.

Judiciary chief Ayatollah Mahmoud Hashemi Shahrudi has ordered immediate action be taken on the detained protesters and said that detainees with no major charges should be released on bail within one week.