East Idaho’s Marsh Valley High School and Marsh Valley Middle School were placed on a brief lockdown Wednesday, after an alleged pistol-whipping incident, the Idaho State Journal reported.

The alleged attack did not occur on school grounds, Bannock County Sheriff Lorin Neilsen told the Journal. Instead, he said, the incident occurred when two siblings were driving to one of their parents’ homes. Neilsen said the driver, a teen-aged boy, attacked and threatened to shoot his sister, a passenger in the car.

After the girl arrived at Marsh Valley High School and told friends about the alleged attack, her friends called the sheriff’s office. After that, the schools were placed in lockdown for about an hour, the Journal reported.

No charges have been filed, and the incident remains under investigation, the Journal reported.