Pakistan has detained more than 200 suspected Islamic militants in response to international pressure to crack down on extremists after the London bombings.
Police have raided religious schools as part of the security operation. A senior government official said President Pervez Musharraf had given orders to stop the spread of violence and hatred.
The focus of attention has shifted to Pakistan in recent days but Scotland Yard has continued to concentrate on the investigation back in Britain.
Experts are still trying to identify the type of explosives used by the bombers. Police are examining thousands of CCTV tapes, witness statements and calls to the Anti-Terrorist hotline.
