The Prime Minister, David Cameron, has reacted to the death of Labour MP Jo Cox, who was shot and stabbed during an attack in her constituency.

Mr Cameron said Mrs Cox was "a star for her constituents, a star in parliament, and right across the house".

Both official EU referendum campaigns have suspended their operations as a mark of respect.

West Yorkshire Police said a 52-year-old man was arrested near Market Street, Birstall, where the MP held a weekly advice surgery.