BRUSSELS (AFP) - European lawmakers accused Tehran Monday of blocking their planned visit to Iran this week, and complained that opposition to the trip by members of the US Congress had contributed to the move. Earlier, Tehran said the MPs themselves had postponed the trip. In a surprise move, the Iranian ambassador in Brussels-Ali Asghar Khaji on Sunday blocked the planned Jan 7-11 visit to Iran by a delegation of MEPs, the Greens bloc in the assembly said in a statement. German Green MEP and head of the delegation, Barbara Lochbihler, said: I regret this last minute move to block the EU parliament visit to Iran, which is further proof of the Iranian authorities blank refusal to allow any serious discussion about the grave unresolved issues in the country. The EU lawmakers were due to meet human rights activists as well as Iranian parliamentarians, as Irans opposition faces a government crackdown amid protests over the disputed June re-election of President Mahmoud Ahmadinejad last year. Irans state-run IRNA news agency quoted ministry spokesman Ramin Mehmanparast as saying Monday that a new date for the visit will be found by mutual agreement. He noted the importance of maintaining cooperation between the two parliaments. On Friday, a spokeswoman for European Parliament President Jerzy Buzek said that around 15 members of the US Congress had protested against the EU visit in a letter, arguing that it came at an inappropriate time. The isolated voices within the US Congress and EU parliament who opposed the visit have gifted an easy excuse to Iran to block the trip on grounds of 'media pressure, the Greens said. This does a huge disservice to the Iranians who have been bravely demonstrating for freedom and democracy, their statement said.