An employee for a North Carolina aerospace and defense company was charged this week with making repeated threats to bomb his workplace, according to federal prosecutors.

Kidarryl Phillips, 23, was charged with multiple counts of threatening to use a weapon of mass destruction, federal prosecutors in the Eastern District of North Carolina announced in a statement Monday. Prosecutors said he sent texts saying he was going to blow up Collins Aerospace in Wilson, about 40 miles (64 kilometers) east of Raleigh, at least six times last month.

The texts were sent between two and 16 minutes before he started work in the shipping department as a contract employee, data collected from his badge showed.

Read more: US News & World Report