The Manchester bomber had been a "Subject of Interest" for MI5 - meaning someone they were investigating -- between January and July 2014, and then again in October 2015.
The rally was being planned by UK-based Kashmiri groups to mark the first death anniversary of the commander of the Hizbul Mujahideen terrorist outfit killed in a gun battle with Indian armed forces in the Kashmir Valley on July 8 last year.
The three men, identified as Pakistan born Khurram Shazad Butt, Moroccan-origin Rachid Redouane and Moroccon-Italian Yousef Zaghba, all had high levels of a drug called DHEA in their system, according to a toxicologist report presented at a pre-inquest hearing at the Old Bailey court in London.
The police identified 2 of London attackers as Khuram Shazad Butt and Rachid Redouane.
Are we creating videos that can flick on the jihadi switch, asks Vaihayasi Pande Daniel.