Manchester Arena attack survivors and relatives take legal action against MI5

Floral tributes in St Ann’s Square, Manchester in 2018, on the first anniversary of the attack. Photograph: Christopher Furlong/Getty Images

Hundreds of the Manchester Arena bombing survivors, along with relatives of the victims, have launched legal action against MI5, claiming it failed to take action that could have stopped the attack.

More than 250 people have joined the group action against MI5 and have submitted their claim to the investigatory powers tribunal, which hears complaints against the intelligence services.