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London (CNN) -- UK police have defended the decision to take the partner of the reporter who broke the news about secret U.S. surveillance programs into custody at London's Heathrow Airport as "legally and procedurally sound."

Reporter Glenn Greenwald told Brazilian media Monday that UK authorities are "are going to regret what they did" after his partner, 28-year-old David Miranda, was held for nearly nine hours Sunday while reportedly on his way home to Brazil after leaving Berlin.

Authorities seized his laptop, phone, USB sticks and other materials, The Guardian reported.

London's Metropolitan Police, which takes a lead role in counterterrorism efforts in Britain, did not name Miranda in its statement but said its actions were justified.