A blast at an explosives store wrecked buildings and caused massive damage to an industrial zone on the Seychelles' main island Mahe, officials said, prompting the president to declare a state of emergency. The blast shook the island as heavy rains triggered flooding which killed three people, the president told reporters on Thursday, calling for a minute of silence. Footage broadcast on national television showed streets covered in deep mud and strewn with debris and uprooted trees. "Following an explosion at the CCCL explosives store that has caused massive damage to the Providence Industrial area and the surrounding areas and…