Four people, including a police officer and the attacker, died after a car ploughed into pedestrians on Westminster Bridge before an attacker stabbed a police officer protecting Parliament. At least 20 people were injured in the incident.
“My thoughts, prayers and sympathies are with the people of London and the loved ones of the victims affected by this incident. People across the world will stand with the city after today’s event,” said Mrs Long.
“As a former MP, I always felt secure at Parliament due to the protection offered by the police officers there. They and other emergency services deserve praise for their quick response today.
“This attack was on innocent members of the public – workers, shoppers and tourists. It was also an assault on the heart of the democratic institutions. We will not let those behind such acts of violence win out. We live in a liberal, democratic society and it is up to every one of us to redouble our efforts to ensure terrorism will not undermine that.”