Ironically, 28-year-old British man Usman Khan was attending a rehabilitation conference beside London Bridge when he went on a stabbing rampage. He killed a man and woman before bystanders were able to chase him down and wrestle him to the ground.
One man sprayed Khan with a fire extinguisher while another threatened him with a five foot Narwhal Whale tusk, which he’d apparently pulled from the wall of the historical Fishmonger’s Hall. Several people held Khan down while waiting for police, but then Khan appeared to have on a suicide vest.
The bystanders backed away.
When Khan motioned to the vest, the police shot and killed him.