I’m appalled and sickened that people should lose their lives in this way and our thoughts are very much with the family and the friends of the victims today.
“I’ve obviously talked to the chief constable at Thames Valley police, thanked him and his officers for their bravery in tackling the suspect.
“We now have someone in custody. The police must get on with their job, get to the bottom of exactly what happened, and so it would be difficult really to comment in detail.
“Except to say this: if there are lessons we need to learn about how we handle such cases, how we handle the events leading up to such cases, then we will learn those lessons and we will not hesitate to take action where necessary.”