KABUL (AFP/Reuters) - Five US soldiers were killed by a bomb in southern Afghanistan on Thursday, as the Taliban rejected a US claim to have killed the fighters who shot down an American helicopter killing 38 troops. The soldiers nationalities and full details of the blast were not disclosed by the International Security Assistance Force (Isaf) but they were the latest victims of the deadly insurgencys increasing use of crude, home-made bombs. Another foreign soldier was also killed by a roadside bomb in southern Afghanistan on Wednesday, ISAF said, giving no further details. At least 387 coalition soldiers have now been killed in Afghanistan so far this year, according to an AFP tally based on that kept by independent website icasualties.org. That compares to a total of 711 deaths for the whole of last year. Separately, officials said five Afghan police were killed in an overnight clash with the Taliban in the southern province of Helmand. One of our police posts was attacked in Gereshk last night. Five policemen were killed, said Helmand provincial police chief Abdul Hakim Angaar. The latest deaths come a week after the Taliban shot down a US helicopter, killing 38 people including 30 Americans, the biggest loss of US life in a single incident since the 2001 invasion. On Wednesday, US General John Allen, commander of the Nato-led international force in Afghanistan, said the Taliban fighters responsible for downing the helicopter had been killed in an air strike. But Taliban spokesman Zabiullah Mujahid said that was not true. After seeing the enemy statement, we contacted the mujahed (fighter) who shot down the helicopter and hes not dead. Hes busy conducting jihad elsewhere in the country, Mujahid told AFP by telephone from an undisclosed location. Mujahid admitted that four ordinary Taliban fighters had been killed in the US air strike but said they were not the ones who shot down the helicopter. He added that the fighter responsible had now left Wardak province, where the crash took place in the Tangi Valley area of wild, Taliban-infested Sayd Abad district.