• Theresa May, the the home secretary, has dismissed a warning by the former lord chancellor Lord Falconer of Thoroton that the Metropolitan police had no legal basis to detain David Miranda under the Terrorism Act 2000. As Nicholas Watt reports, after a warning from Falconer that the authorities had "incompetently" used the wrong law to detain Miranda, the home secretary said that the police had acted within the correct "framework". (See 2.01pm.)

• The Independent Police Complaints Commission has said that it has "concerns" about schedule 7 of the Terrorism Act, the law used to detain David Miranda.

IPCC Dep Chair Deborah Glass has responded to @indyvoices’ article on the David Miranda incident & the IPCC's role http://t.co/jNjF6cTipC — IPCC Press Office (@IPCCNews) August 21, 2013

• The Russian government has criticised Britain over the treatment of the Guardian. A spokesman for the Russian foreign ministry said Number 10's decision to get the Guardian to destroy or surrender computer files containing secret intelligence was an example "the double standards applied by London in the sphere of human rights". (See 3.49pm.)

That's all from me (Andrew Sparrow) for today.

A colleague may be topping this blog up later if there are any further developments.