Investigators have uncovered evidence in videos that, they say, could explain the 15-year-old suspect's motives.
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Case numbers are beginning to fall in places such as the Northeast.
The move comes as the security situation there deteriorates and the U.S. rushes military aid to Ukraine.
Wall Street is now suffering losses that are impacting the retirement savings of millions.
North Carolina turned into a winter wonderland, with most of the state seeing up to four inches of snow.