Kabul ? An American service member died Friday when his vehicle struck a bomb in eastern Afghanistan, making August the deadliest month for U.S. forces in the nearly eight-year war.

The grim milestone comes as the top U.S. commander prepares to submit his assessment of the conflict — a report expected to trigger intense debate on the Obama administration’s strategy in an increasingly unpopular war.

The latest death was reported as Afghan officials announced an 80 percent increase in the number of major fraud allegations submitted after last week’s disputed presidential election — a sign of the deep challenges facing the U.S. and its allies in shoring up a legitimate Afghan government capable of withstanding the Taliban insurgency, corruption and drug trafficking.

A brief statement by the NATO command gave few details of the blast and did not say precisely where it occurred. U.S. military spokeswoman Capt. Elizabeth Mathias said the service member who died was American.

That brought to 45 the number of U.S. service members killed this month in the Afghan war — one more than the previous monthly record, set in July.

American casualties have been rising steadily following President Barack Obama’s decision to send 21,000 additional troops to Afghanistan to combat a resurgent Taliban and train Afghan security forces to assume a greater role in battling the insurgents.

A record 62,000 U.S. troops are now in the country, with 4,000 more due before year’s end.