The terror threat level has been lowered nationwide, but several US airports are still on high alert: Terror threat level still ‘high’ at eight US airports.

Announcing the lowering of the threat level Friday, after 19 days of intense nationwide security precautions, Homeland Security Secretary Tom Ridge said that the United States would however “maintain particular vigilance around some critical resources and locales,” The Washington Post reported Saturday.

Without giving details he said most of the increased security would involve “the private sector” and this included airlines.

Sources told the paper those facilities included eight airports, including those in Washington, New York, Los Angeles and Las Vegas.