A bomb threat that shut down a Central Texas Walmart Supercenter in March has been traced to two prank callers from Connecticut.

The Walmart Supercenter in Lampasas was evacuated on Thursday, March 3 around 10 AM after an employee received a phone call claiming an explosive device was hidden in the store.

The Lampasas Police Department and a Fort Hood canine bomb unit combed the store at 1710 Central Texas Expressway, but found no evidence of a bomb.

The next day, the same employee answered the store phone and was taunted by the same caller. The employee was able to obtain the number from which the call was placed and passed it on to police.

According to a statement from the Lampasas Police Department, FBI agents were able to trace the calls to Branford, Connecticut. After conducting several interviews, they narrowed the investigation down to two suspects, ages 16 and 17.

Investigators say the two placed calls to several Walmart locations across the U.S. on the same date as the threat against Lampasas’ store. The State of Connecticut Division of Juvenile Justice is reportedly pursuing charges against the pair.

In a statement, Assistant Lampasas Police Chief Sammy Bailey credited the Walmart employee with gathering information that proved key to the investigation.