UPDATE:
CAMBRIDGE, Mass. (AP) - Police in Mass. say after search that reports of gunman on MIT campus are unfounded.
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BOSTON (AP) - The Massachusetts Institute of Technology says a man carrying a long rifle and wearing body armor was spotted in a campus building, and the school is on lockdown.
MIT said in a statement Saturday that several law enforcement agencies have responded.
The school advises students and workers to stay indoors and report suspicious activity to campus police.
More details were not immediately available.
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