Documentary exploring accusations made following the death of Bin Laden. Top CIA officers and Western diplomats say Pakistan's military is duping its western allies.

In May this year, US Special Forces shot and killed Osama Bin Laden in Pakistan. Publicly Pakistan is one of America's closest allies - yet every step of the operation was kept secret from it.

Filmed largely in Pakistan and Afghanistan, this two-part documentary series explores how a supposed ally stands accused by top CIA officers and Western diplomats of causing the deaths of thousands of coalition soldiers in Afghanistan. It is a charge denied by Pakistan's military establishment, but the documentary makers meet serving Taliban commanders who describe the support they get from Pakistan in terms of weapons, training and a place to hide.

This first episode investigates signs of duplicity that emerged after 9/11 and disturbing intelligence reports after Britain's forces entered Helmand in 2006.