RT Journal Article SR Electronic T1 Lessons identified from the 2017 Manchester and London terrorism incidents. Part 1: introduction and the prehospital phase JF BMJ Military Health JO BMJ Mil Health FD British Medical Journal Publishing Group SP 111 OP 114 DO 10.1136/jramc-2018-000934 VO 166 IS 2 A1 Paul Hunt YR 2020 UL http://militaryhealth.bmj.com/content/166/2/111.abstract AB This is the first article in a three-part series detailing the lessons identified during the NHS England clinical debrief meetings which followed the response to the 2017 Manchester and London terrorist incidents. It covers the prehospital phase including the overall key learning points, timeline information, scene challenges, resource utilisation, triage, distribution and helicopter emergency medical service feedback.