Police charged two people with endangering others after finding apparent explosive material at a home in Ferguson in Pulaski County.
Police also charged Ember Collins, 20, and Robert Ware, 31, with drug possession, according to a news release from the Somerset Police Department.
Police found what appears to be a low-explosive powder at the house, said Matthew White, a supervisor with the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives in Lexington.
Collins and Ware have not been charged with federal offenses, but could be. Material found at their house is being tested, White said.
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Local and federal authorities said it's not yet clear why the two had the material.
"That's really kind of a mystery at this point," said Michael Grigsby, a Somerset police detective who is investigating. "There's really no legitimate reason for them to have what they had."
The case started after someone at the address where the material was found called 911 about 1:30 p.m. Thursday, but hung up. Somerset police went to make sure there were no problems at the house, where Ware and Collins lived, Grigsby said.
While talking to residents at the house, police saw what they thought could be a pipe bomb and commercial-blasting materials, according to a news release.
Police got the people out of the house and notified ATF and the state police hazardous materials unit.
The investigation showed there was no pipe bomb at the house, White said.
In addition to what is thought to be low-explosive material, however, there were items in the house similar to blasting caps that had been exploded, White said.