Iranian opposition leader Mir-Hossein Moussavi called for calm following clashes Saturday between his supporters and riot police in the capital Tehran, according to dpa. Thousands of Moussavi supporters held protest demonstrations following alleged fraud in Friday's presidential election which led to a landslide victory for incumbent President Mahmoud Ahmadinejad. The demonstrations, which did not have the required permission from the Interior Ministry, turned violent after police intervened. In a statement Moussavi called on his supporters not to fall into the trap of violence, reassuring them that he would safeguard their rights. Moussavi had earlier said that the people would not accept the "charade" by the government and neither accept nor follow a president who has come to power through fraud.