At least 28 Iranian pilgrims were killed when a bus heading to neighbouring Iraq crashed into a residential building in a town near the border on Monday, the state broadcaster said. "Twenty-eight people were killed in this accident and nine were seriously injured," a hospital director in the western province of Ilam was quoted as saying after the crash in the town of Chavar. Thousands of Shiite Iranians visit holy sites in Iraq every year, especially during major pilgrimages.