Firearms officers “lawfully killed” terrorist Usman Khan on London Bridge after he stabbed two Cambridge university graduates because they believed he was trying to detonate a suicide belt, an inquest jury has concluded.The 28-year-old homegrown jihadi was finally gunned down by an effective firing squad of armed officers outside Fishmongers’ Hall after Khan strapped kitchen knives to his hands and attacked delegates at a prisoner education event in November 2019.Khan was also apparently strapped with explosives, which was later found to be a fake suicide belt.