Britain has confronted dozens of lethal plots traced to Iran in recent years, but the release of the suspects could indicate they were not seen as an imminent threat.

A strike on a train that imperiled former European leaders and CIA officers is among a spate of attacks that risked a dangerous escalation with the West, experts say.

The terrorist organization and its offshoots have set up at least eight training sites over the past three years, taking advantage of the Taliban’s return to power.