A huge billboard collapsed Monday during a dust storm in India’s financial capital of Mumbai, killing at least 14 people and injuring more than 70 others, local officials say. Several others may still be trapped. The incident happened at 4:30 p.m. on Monday when a strong dust and rain storm moved through the megacity, turning the sky dark while uprooting trees, damaging buildings and causing power outages. Video showed the massive billboard – 70 by 50 meters in size – falling over amid strong winds, crushing a gas station, cars and several homes in Ghatkopar, a suburb in eastern Mumbai not far…