Obama hints at rethink on NSA spying
21 December 2013 Last updated at 05:25 GMT
US President Barack Obama has suggested there may be a review of surveillance by the National Security Agency in the wake of a series of spying revelations.
Mr Obama said ex-NSA contractor Edward Snowden had caused "unnecessary damage" by leaking documents.
On Friday, more details of people and institutions targeted by UK and US surveillance - from documents leaked by Mr Snowden - were published by The Guardian, The New York Times and Der Spiegel.
Katy Watson reports.