UK won't change terror threat level after attack: PM Theresa May

The attack saw a police officer and four others killed by an assailant

Britain will not change its terrorism threat level despite an attack in London which left three people and the assailant dead, Prime Minister Theresa May said.

"The UK threat level has been set as severe for some time and this will not change," she said in a televised address outside her Downing Street office.

The attack saw a police officer and two others killed by an assailant who was then shot dead by armed police outside the parliament in central London.