An Iranian court has issued a death sentence against Mahan Sedarat, a man arrested during the nationwide protests sparked by the September death of a 22-year-old woman in the custody of morality police.The defendant was charged with carrying a cold weapon, as well as with assembly and collusion against Iran's national security.The wave of anti-government demonstrations that have convulsed Iran for more than eight weeks is one of the biggest challenges to the country's clerical rulers since the 1979 Islamic Revolution.Security forces unleashed a fierce crackdown on the mainly peaceful protest movement, arresting several thousand people, subjecting detainees to various forms of physical and psychological torture, and killing more than 300.Officials have blamed foreign powers for the unrest, without providing any evidence."