Overview

• More than 250 survivors and relatives of the 2017 Manchester Arena bombing have filed a lawsuit against MI5, alleging the agency failed to act on crucial intelligence.
• An inquiry last year found MI5 had significant opportunities to prevent the attack by acting on intelligence about bomber Salman Abedi.
• MI5 head Ken McCallum publicly apologized, acknowledging the agency's failure to prevent the tragedy.
• The lawsuit, a first of its kind against MI5, has been submitted to the UK’s Investigatory Powers Tribunal.
• The legal action highlights ongoing concerns about intelligence handling and accountability in preventing terrorist attacks.