Relatives, colleagues and residents gathered in a county in central China on the weekend to pay tribute to six firefighters who died after putting out a blaze during the Chinese New Year holidays.The firefighters were killed on Thursday afternoon when their truck ran off a cliff in Xinhua county, Hunan province, as they were returning from extinguishing a house fire in the hills.A seventh firefighter in the truck was injured and transferred to a hospital in the capital city of Changsha that...