Only three people - a former Russian spy, his daughter and a police officer - remain in hospital

21 people have been treated after Sunday's nerve agent attack in the UK, police have said.

The suspected targets - a former Russian spy and his daughter - are both seriously ill in hospital.

Sergei Skripal (66) and his daughter Yulia (33) are believed to be have been deliberately targeted in what police are describing as 'attempted murder'.

A police officer who was affected - named by Wiltshire Police as Detective Sergeant Nick Bailey - is now awake and talking.

While it has been confirmed 21 people were treated at various capacities, Sergei Skripal, Yulia Skripal and Nick Bailey are the only three people still in hospital.

Picture by: Matt Dunham/AP/Press Association Images

Earlier, British Home Secretary Amber Rudd described the attack as 'brazen and reckless'.

She told the House of Commons: "This was attempted murder in the most cruel and public way."

The investigation is currently being led by members of the Met Police's counter-terrorism team, although it has not yet been declared an act of terrorism. 

Sergei Skripal was convicted in Russia in 2006 of passing state secrets to Britain, and was later given refuge in the UK as part of a spy swap.