Three Americans killed in 'green-on-blue' attack

According to the ISAF, an individual wearing an Afghanistan National Army uniform "turned his weapon against the ISAF service members in eastern Afghanistan."

An investigation is underway, according to NATO.

Meanwhile, in western Afghanistan, an Italian soldier was killed and three others were wounded when someone threw explosives into an armored vehicle, according to The Guardian. The attack came while the soldiers were coming back to base after training Afghanistan security forces.

Earlier in the week the House Armed Services Committee approved a draft of a budget bill that requires President Obama and Defense Secretary Chuck HagelChuck HagelThere's still time for another third-party option Hagel says NATO deployment could spark a new Cold War with Russia Overnight Defense: House panel unveils 5B defense spending bill MORE to report the Obama administration's plans for postwar Afghanistan. Those details include missions and troop numbers after the United States withdraws from the country.