Geneva, Aug 13 (DPA) Three human rights experts working with the United Nations said Thursday they were concerned over reports from Iran of torture being used to obtain confessions about unrest that followed June's Iranian presidential elections.

The experts said the confessions of lawyers, journalists, rights activists and members of the opposition should not be used in court against them.

'No judicial system can consider as valid a confession obtained as a result of harsh interrogations or under torture,' said Manfred Nowak, the UN special rapporteur on torture.

In a statement, the UN rights officials said there were detainees being held incommunicado, some without any charges filed against them. In some cases, they were denied family visits, legal assistance and medical treatment, the three alleged.