ABC TV NEWS REPORTS:

Southeast HOUSTON.... GUNSHIPS FIRING... people scared... "What's Happening??"

KTRK-TV in Houston reported that the U.S. Army along with other agencies took over the Carnegie Vanguard High School in Houston on Monday. Alarmed residents called police and complained about gunshots and helicopters.

The Army did not give any details on what the training was for, according to the news station, and a Google News search produced no announcement of the exercise.

http://abclocal.go.com/ktrk/story?section=news/local&id=8971311

Courtesy of Info Wars
http://www.infowars.com/houston-residents-rattled-by-government-gunfire-and-helicopters/