听力原文： Indian police have found a large cache of plastic explosives in Bombay, the type used. in last month's serial bombings that killed more than 300 people Police say they seized nearly 2,000 kilograms of explosives from a marshy region north of Bombay. About 1,300 kilograms of similar explosives were discovered in the area last week. Police also arrested 14 more people in connection with the bombings. The Indian police were reported to have discovered______