A Rowlett man accused of mailing more than 500 white powder hoax letters across the world pleaded guilty to five counts of giving false information and hoaxes Friday.
67-year-old Hong Minh Truong was accused of sending the letters to U.S. government offices, daycares, aerospace companies and hotels.
FBI officials said he had been sending the letters since December 2008 from the North Texas area. It took investigators six years to break the case. Truong was arrested in 2014.
Hazmat crews responded to many of the letters destinations.
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Truong will be sentenced at a later date. He faces up to five years in prison for each count to which he pleaded guilty.
There was some question about Truong's mental capacity, but he was found competent to stand trial despite being treated for mental illnes.