THIRUVANANTHAPURAM, India — The Hindu temple in southern India was packed with thousands for a religious festival early Sunday when the fireworks began — an unauthorized pyrotechnic display that went horribly wrong. Explosions and a massive fire swept rapidly through the Puttingal temple complex about 3 a.m. in the village of Paravoor, killing 102 people and injuring 380 others, officials said. Scores of devotees ran in panic as the massive initial blast cut off power in the complex, while other explosions sent flames and debris raining down, a witness said.