Iranian opposition leader Mir-Hossein Mousavi urges to mourn for dead protesters

Iran's defeated presidential election candidate Mir-Hossein Mousavi urges his supporters to wear black to a planned rally in mourning for lives lost during this week's protests.

In this image issued by the government run Fars News Agency, a  supporter of pro-reform leader Mir Hossein Mousavi, covers her face  with piece of cloth in green and a sign in Persian reads' Mir Hossein  Mousavi' during a rally in Tehran, Iran, on Wednesday June, 17, 2009.  (AP Photo/Fars news agency)

Thursday's protest will be the fourth straight day of major marches in Tehran. Mousavi's Web site says he may join the rally to be held in square in the city.

Seven demonstrators were shot on Monday by pro-regime militia in the first confirmed deaths since the unrest erupted after the election, which the government said President Mahmoud Ahmadinejad won in a landslide victory.