A US soldier fighting the Taliban insurgency in southern Afghanistan has died after a bomb attack, the NATO-run International Security Assistance Force (ISAF) said Thursday. ISAF said the soldier died on October 21, but gave no further details. Homemade bombs planted by roadsides are becoming the major killer of foreign forces in Afghanistan, Western political leaders have said. The icasulaties.org website says 418 foreign troops -- of which there are more than 100,000 under US and NATO command in Afghanistan -- have died so far this year. The total for 2008 was 294. US President Barack Obama is considering a request from his senior commander in the country for another 40,000 troops to boost the anti-insurgency war. 