Londoners have left flowers, candles and messages outside Westminster as tributes to Labour Party legislator Jo Cox murdered on Thursday.

The 41-year-old was shot and stabbed to death in her constituency near Leeds in northern England. Hundreds of people attended a vigil at a local church. A 52-year-old man, named locally as Tommy Mair, has been arrested but not charged.

Witnesses of the attack on Cox reported hearing the gunman shout "Britain First". The far-right political party Britain First has denounced the attack and said its party had no involvement in it.

Cox was a supporter of Britain staying in the EU. The killing prompted a halt to campaigning in the EU referendum. Though the motives of the killer were not immediately clear, some speculated that sympathy for Cox could boost the 'Remain' campaign which has fallen behind 'Leave' in recent days.