Updated

Seven northern Virginia high schools have received bomb threats that disrupted classes and in some cases forced evacuations.

Police in Fairfax, Loudoun and Arlington counties and the city of Falls Church responded to the threats. None was found to be legitimate.

Police say the recorded messages started coming in about 11:30 a.m. Friday. Affected schools included McLean, Westfield, Herndon and The Potomac School in Fairfax County; Stone Bridge in Loudoun; Bishop O'Connell in Arlington County and George Mason High in Falls Church.

Arlington and Falls Church police said the calls in their jurisdictions appear to be connected to those in the other counties.

Megan Hawkins, a spokeswoman for Fairfax County Police, said she did not know if the calls were connected to a bomb-threat hoax earlier this week at McLean.