Anti-terror assessor David Anderson has said it is a concern that two terror suspects have absconded.
Speaking to the Home Affairs Committee, the UK Independent Reviewer of Terrorism called Tpims a slightly unhappy compromise.
Tpims, or Terrorism Prevention and Investigation Measures, were introduced last year to monitor terror suspects.
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A man who killed and dismembered his father told a court he gave away a Saw movie box set the day after to "disassociate" himself from them.