text:  Residents packed City Hall demanding answers. The police chief says the boy had what appeared to be a handgun. It was actually a pellet gun. Iran will have a one-off election to replace its president, who died in a helicopter crash last month after no candidate secured a majority in a vote with record low turnout for the country. CBS's Elizabeth Palmer is in Tehran. The final vote count added up to the worst ever turnout in a presidential election and failed to produce a clear winner.