Suspect packages contained explosive black powder

The suspect packages sent to Army Careers offices were in A4-sized envelopes, postmarked Ireland, contained black powder which was explosive and if ignited would have caused flash burns, ITV News' Juliet Bremner understands.

However, the officers who discovered the suspect packages are not certain that they would have exploded.

This indicates that Irish dissident groups were very likely behind the attack.

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'IRA' claims responsibility for devices sent to Army offices

A group calling itself the IRA has claimed it was behind devices sent to armed forces recruitment centres last week, Scotland Yard said. Packages were discovered at army careers offices in Oxford, Brighton, Canterbury and Slough yesterday.