BOSTON (AP) — The man identified as the shooter who killed two Brown University students and an MIT professor planned the attack for years and left behind videos in which he confessed to the murders but gave no motive, according to information released Tuesday by the U.S. Department of Justice.

Claudio Neves Valente, 48, a former Brown student and Portuguese national, was found dead in a New Hampshire storage facility after he killed two students and wounded nine others in an engineering building on Dec. 13. Two days later he killed MIT professor Nuno F.G. Loureiro in his home in the Boston suburb of Brookline.

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