Following his release in January 2020 Amman was "under active counter-terrorism surveillance". According to "The Guardian", the attacker was "considered to pose a serious risk, and was well known to the counter-terror authorities, he was also the subject of a live investigation". British Prime Minister Boris Johnson thanked the emergency services for responding to the incident, and said that his thoughts were "with the injured and all those affected". Mayor of London Sadiq Khan thanked the "police, security and emergency services staff for their swift and courageous response". Home Secretary Priti Patel said "My first thoughts are with the victims, our brave police and emergency services and their families". On 3 February the government announced that emergency legislation would be introduced to end the automatic release of prisoners convicted of terrorism from being released after serving half their sentence. Secretary of State for Justice Robert Buckland told the House of Commons that the new law would apply to current and future prisoners. Lord Carlile, a barrister and former independent reviewer of terrorism legislation, suggested the government could face a legal challenge if the new legislation was applied retrospectively. The Terrorist Offenders Bill was presented to parliament on 11 February. On 12 February the Bill cleared all of the stages required for it to pass through the House of Commons, doing so without the need for a vote. The bill received Royal assent on 26 February, and went into effect, immediately preventing the automatic release of 50 convicted terrorists.