KABUL, Afghanistan â€"  NATO says two foreign aid workers and their two Afghan colleagues, kidnapped and held by insurgents in northern Afghanistan, have been rescued in an early morning raid.

The two foreign aid workers -- Helen Johnston and Moragwe Oirere -- and two of their Afghan colleagues were kidnapped on May 22 in Badakhshan province.

They worked for Medair, a humanitarian non-governmental organization based near Lausanne, Switzerland.

U.S. Gen. John Allen, the top commander of American and NATO forces in Afghanistan, said in a statement that coalition forces conducted the rescue mission early Saturday with the support of the Afghan Ministry of Interior.