( CNN ) -- A man wearing an Afghan National Army uniform shot at coalition service members in eastern Afghanistan Friday , killing one , officials said . NATO 's International Security Assistance Force did not say which country the deceased soldier was from . But a local police chief in Kunar province said the deceased soldier was an American . It is unclear whether the attacker is an Afghan soldier or an infiltrator wearing the uniform . Police said the attacker was an Afghan soldier . But the Taliban said the attacker was part of the Taliban and had infiltrated in order to attack foreign soldiers , said Zabiullah Mujahid , a spokesman for the militant group . The problem of Afghan troops who have turned their weapons on allied forces -- so-called green on blue attacks -- has intensified this year . In March , Gen. John Allen , the commander of the NATO-led International Security Assistance Force , said `` an erosion of trust that has emerged from this , '' but said that the systems the Afghans and ISAF have in place to help stop these attacks before they happen is having an effect . Allen said ISAF officials are working on a new procedure to check the backgrounds of Afghans who sign up for the army or police force , and the Afghans `` have taken a lot of steps themselves . '' The attacker was able to escape after the shootings , police said .
The attack occurs in eastern Afghanistan . It is unclear whether the attacker is an Afghan soldier or an infiltrator . The story of Afghan troops who have turned their weapons on allied forces has emerged .