He is based at New Scotland Yard and has been in his post since September 1997.
Scottish National Party MP Angus McNeil said he had alerted Scotland Yard to the allegations.
BBC: Trish Law said her MP husband Peter came under pressure
Scotland Yard said officers were working closely with Portuguese police and considering their next steps.
But Bob Quick, head of Scotland Yard's Counter Terrorism Command, said the ruling was "catastrophic".
The suspects are due to appear at the Old Bailey on Wednesday, Scotland Yard said.
BBC: Luke Harwood death: Sixth person charged in murder inquiry
The National Black Police Association (NBPA) questioned whether Scotland Yard had a "vendetta" against Mr Dizaei.
Police investigating the 58-year-old's murder had sent CCTV images to Scotland Yard for further consideration.
Scotland Yard said it would be taking no further action following the incident earlier in March.
This total was a sixth lower than the corresponding figure a decade ago, Scotland Yard said.
Scotland Yard is currently considering whether to launch criminal inquiries into any potentially fraudulent claims.
The operation is being run alongside Scotland Yard's Operation Weeting, which is looking into phone hacking.
The Scotland Yard official in charge of anti-terrorism, John Yates, is to be suspended.
Scotland Yard has admitted giving MPs inaccurate information by denying "covert officers" were deployed.
The case was referred to Scotland Yard in October 2010, but police took no action.
Mr Rexhepi is one of 17 on the most-wanted list released by Scotland Yard and Crimestoppers.
Scotland Yard said it would not comment on how many people it was speaking to.
BBC: The then-chief whip, Andrew Mitchell, in Downing Street
Scotland Yard has arrested a man as part of an investigation into computer hacking and privacy breaches.
Theirs are the first arrests since Scotland Yard launched a new investigation into the matter in January.
Former News International boss Rebekah Brooks has been formally charged over phone hacking, Scotland Yard has said.
Scotland Yard said the bomb was aimed to cause serious injury, describing it as "criminal and vicious".
Scotland Yard's appeal on Facebook and YouTube features emotional interviews with Negus's mother and sister.
Scotland Yard's paedophile unit does not have staff trained to use the police's Holmes national computer database.
Scotland Yard said Ch Supt Rowell was "currently away from his office" and was being replaced temporarily.
Musharraf said he expected the Scotland Yard investigators to help "solve all the confusion" surrounding the case.
Det Ch Insp Caroline Goode, who led Scotland Yard's investigation into a 2006 "honour killing" receives the Queen's Police Medal.
He also served as the head of counter-terrorism within Scotland Yard, with both national and international responsibilities.
He was dismissed after a Scotland Yard misconduct panel found his actions had discredited the police service.
There are nine detectives at Scotland Yard who specialise in investigating war crimes, alongside their other duties.
The Electoral Commission called in Scotland Yard after allegations of postal vote scams in Tower Hamlets last year.
The gifts were taken between Friday and Monday from a private part of the hospital, Scotland Yard said.
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