British authorities say the man fatally shot by police at a subway station Friday was not connected to the recent attacks on London's transit system.
In a statement released on Saturday, Scotland Yard called the shooting a "tragedy," and one that London's Metropolitan Police deeply regrets.
Police identified the man as a 27-year-old Brazilian national, Jean Charles Menezes.
Officials say he was under surveillance in connection with Thursday's attempted bombings, and that he refused police orders to stop while running through a subway station.
Witnesses said plainclothes officers chased the man onto a subway car, and then shot him at point-blank range.
Muslim leaders condemned the killing and called for a full investigation.
Meanwhile, experts say forensic evidence and the timing of Thursday's attacks, exactly two weeks after the July seventh bombings that killed 56 people, suggest both attacks may have been planned by the same terrorist group.