In this image made available from Mousavi's election campaign media operation Ghalam News shows supporters of opposition leader Mir Hossein Mousavi, as they listen to his speech at a demonstration in Tehran on Thursday June, 18, 2009. . Tens of thousands of black-clad protesters filled the streets of Tehran again Thursday, joining opposition leader Mir Hossein Mousavi to mourn demonstrators killed in clashes over Iran's disputed election.