Prime Minister David Cameron said the government's security services sometimes rely on accessing the confidential data of individuals in order to identify and disrupt terrorist plots.
Speaking at a joint press conference with Liberal Democrat leader Nick Clegg, Mr Cameron said the recent legal judgement on privacy rights by the European Court of Justice has left some legal ambiguity as to whether internet companies are obliged to hand over data, and this needed to be cleared up.
More top news
Protesters angry that far-right leader Marine Le Pen is advancing the French presidential runoff are scuffling with police in Paris.
Polling projections show the far-right leader Marine Le Pen and centrist Emmanuel Macron leading in the first-round of the French election.
Winds veer northerly overnight and a band of patchy rain moves slowly southwards - wintry in places.