Petersburg High School reported its third bomb threat in three days Friday, school officials said.
"The West Virginia State Police, Grant County Sheriff's Department and the Petersburg City Police are all investigating the incident," said Debra Mohr, the Grant County Board of Education's director of student services. "Students were evacuated and no injuries have been reported."
The students were also evacuated after the bomb threats on Wednesday and Thursday.
"No devices have been located at this time," said 1st Sgt. Charles Platt of the State Police, who added that State Police officials had ordered a search of the school with the help of a canine unit.
Platt said there are no suspects in the incidents at this time.
He added there was talk of the implementation of a new policy in reference to the incidents that may result in cancellation of some school functions this weekend.
The first bomb threat was reported Tuesday at around 1:55 p.m., while the second was reported Wednesday around lunchtime, officials said. Friday's threat was reported early in the school day.
The incidents are still under investigation. No further information was available at presstime.