Relations between India and Pakistan – who on 1998 became nuclear powers – are tense at the best of times.
Relations are made worse by a suspicion that the secret services of both nations are taking part in a clandestine war - planting bombs on railway lines and amongst crowds, killing dozens on each side.
Phil Rees traveled to Pakistan and India to find out who is behind a series of mysterious bombings in South Asia's secret war of terror.
This BBC report appeared on the Correspondent program, which was anchored by Kate Adie.
Producer: Robin Barnwell
Camera: Fred Scott
Executive Producer: Fiona Stourton
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