Intra-Afghan dialogue

Foreign Office hopes negotiators will engage with open-mind to seize historic opportunity for peace

Islamabad urges all sides to exercise maximum restraint

Sources say if all prisoners walked free it would give impression that insurgent group has upper hand over govt

The Taliban have made it clear that they would only join the intra-Afghan talks once their prisoners are released

Afghan government, the Taliban will hold negotiations to end decades-long war, say sources