Washington – The House voted Wednesday to deny military aid to Indonesia until that country fully investigates an ambush last year that killed two Americans.

Rep. Joel Hefley, R-Colo., who sponsored the measure, said the Indonesian government has dragged its feet on investigating the ambush that preliminary reports indicated may have been carried out by Indonesian soldiers.

In August 2002, teachers from the Tembagapura International School were headed to a picnic in Papua, Indonesia , when two vehicles carrying passengers were ambushed.

Rick Spier of Littleton, Colo., and Ted Burgon of Sunriver, Ore., both teachers, were killed in the attack. Eight others were wounded, including a 6-year-old child. Spier's widow, Patsy, who was shot in the back and foot, sought Hefley's support in pushing for a full investigation.

"The victims of this attack and their families deserve a thorough investigation by the Indonesian and US governments," said Hefley. "It is not too much to demand answers about who orchestrated and carried out this ambush and see the perpetrators brought to justice."

Hefley said that after initial reports that the military may have been involved, the Indonesian police have been removed from the case and responsibility has been assigned to the military, which has exonerated itself.

If enacted, the provision would withhold military education and training funds until a thorough investigation is complete. The amendment was added to the Foreign Relations Authorization Act and approved by the House on Wednesday. A similar effort is being led by Sen. Russell Feingold, D-Wisc., in the Senate.