The types of terrorist threats against the U.S. are becoming more diverse, Homeland Security Secretary Janet Napolitano told the Senate Homeland Security Committee in a written statement on Wednesday. The number of attacks against the U.S. has increased in the past 15 months, she said, citing the failed Christmas Day bombing of a U.S airliner and the failed car-bomb attempt in New York City's Times Square. "There is a rising threat from attacks that use improvised explosive devices, other explosives, and small arms," she wrote in a statement presented to the committee. "This type of attack has been common in hot spots around the world for some time, but we have now experienced such attempted attacks in the United States."
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