Current affairs programme featuring interviews and investigative reports. On 22 March 2017, the UK Parliament came under attack in the most serious terror incident in the country for over a decade. Speaking to witnesses and the injured, BBC Panorama pieces together what happened during the attack that left five people, including the attacker, dead and many more injured. The programme also looks into the life of Khalid Masood to ask what motivated him to carry out this fatal terror attack in the heart of London.