2 NATO service members die in Afghanistan blast April 23, 2012 -- Updated 0739 GMT (1539 HKT) The attack takes place Sunday ISAF does not release additional details At least 25 service members have died this month Kabul, Afghanistan (CNN) -- Two service members with the NATO-led International Security Assistance Force were killed in a blast in eastern Afghanistan, the force said Monday. The attack took place Sunday. The ISAF statement did not say where it occurred or offer additional details. Per policy, ISAF also leaves it up to member nations to announce the nationalities of service members who are killed. With Monday's deaths, the number of service members who died in attacks this month in Afghanistan has risen to at least 25 On Thursday, the Taliban claimed responsibility Friday for downing a Black Hawk helicopter in southern Afghanistan.