From British daily The Guardian:
British soldier claims comrade killed by US ‘friendly fire’
Fred Attewill and agencies
Friday December 8, 2006
Jonathan Wigley, 21, died as marines clashed with Taliban fighters in a fierce 10-hour battle on the outskirts of the town of Garmsir, in the southern Helmand province.
But today a fellow soldier said Marine Wigley, of the 45 Commando unit, was killed by an American A-10 tankbuster plane, called in to support the British during the battle after they encountered far tougher than expected resistance.
See also here.