Two female students have been charged in connection with a bomb threat hoax at Parkdale High School Thursday morning, Prince George’s County police said.

The two girls approached the school’s resource officer at about 10:20 a.m. to report a man had asked them for directions to the principal’s office and that he then threatened to blow up the school, a law enforcement source said.

After further investigation, detectives traced a phone call to police about the threat to a cell phone of one of the students, officials said.  The pair were charged with making a false statement of a destructive device and conspiracy to commit a false statement of a destructive device, authorities said.

The students, who were not identified because they are juveniles, were released to their parents on their own recognizance. 

Officers had placed the school on lockdown and called in bomb sniffing dogs to search for explosives, authorities said.

The school was taken off of lockdown at about 11:40 a.m., and investigators soon determined the girls’ story to be a hoax, a law enforcement source said. Video footage contradicted details in their story, and they eventually admitted they had fabricated their encounter with the man, the source said.

This post was updated at 8:30 p.m.