By Sumit Khanna AHMEDABAD, India (Reuters) – At least 68 people were killed when a pedestrian bridge over a river in the western Indian state of Gujarat collapsed on Sunday, plunging hundreds of people into the water, officials said. Authorities said more than 400 people were in and around the suspension bridge over the Machhu River in the town of Morbi at the time of the collapse on Sunday evening. TV footage showed dozens of people clinging onto the cables and twisted remains of the collapsed bridge as emergency teams struggled to rescue them. Some clambered up the broken structure to try to…