On 15 September 2017, at around 08:20 BST (07:20 UTC), an explosion occurred on a District line train at Parsons Green Underground station, in London, England. Thirty people were treated in hospital or an urgent care centre, mostly for burn injuries, by a botched, crude "bucket bomb" with a timer containing the explosive chemical TATP. Police arrested the main suspect, 18-year-old Iraqi asylum seeker Ahmed Hassan, in a departure area of the Port of Dover the next day, and subsequently raided several addresses, including the foster home of an elderly couple in Sunbury-on-Thames where Hassan lived.Hassan arrived in the UK illegally in October 2015 and had said that he had been compelled to undergo training by ISIL with about 1,000 other young people and he had feared members of his family would be killed if he had attempted to resist. The incident was classified by Europol as a case of jihadist terrorism. On 6 April 2019 it was announced that Lt. Col. Craig Palmer, a British Army officer who was that morning a passenger on the affected tube train, had been awarded the Queen's Commendation for Bravery for his part in helping to bring the bomber to trial and conviction.