1/12

Emergency personnel tend to wounded on London Bridge on Saturday. Metropolitan Police Service Assistant Commissioner Mark Rowley (not in picture) said “At 22:08hrs yesterday [June 3] evening we began to receive reports that a vehicle had struck pedestrians on London Bridge.” Photo: AP

People are lead to safety on Southwark Bridge away from London Bridge after the attack. After mowing down pedestrians, the van drove from London Bridge to Borough Market. Photo: Getty Images

In this image made from PA Video footage, people receive medical attention in Thrale Street near London Bridge. Streets around London Bridge and Borough Market, fashionable districts packed with bars and restaurants, would have been busy with people on a Saturday night out. Photo: AP

Police officers clear the area near Borough market at London Bridge. A taxi driver told the BBC that three men got out of the van with long knives and "went randomly along Borough High Street stabbing people." Photo: Getty Images

Counter-terrorism special forces are seen at London Bridge late on Saturday night. Photo: Getty Images

Armed police officers patrol in Borough Market, in London on Sunday. Police rushed to the scene and shot dead the three male attackers in the area near the bridge. Photo: Getty Images

This photo taken by photographer Gabriele Sciotto shows a man, foreground, one of the suspects, wearing what appear to be canisters strapped to his chest lying on the ground after being shot by police outside Borough Market in London on June 3, 2017. Photo: AP

Authorities urged Londoners on Twitter to "run, hide, tell" if they were caught up in the violence. In this picture police officers with riot shields are seen on Borough High Street after the terror attack. Photo: AP

Guests from the Premier Inn Bankside Hotel are evacuated and kept in a group with police on Upper Thames Street. The BBC showed dozens of people, evidently caught up in the attack, being escorted to safety through a police cordon with their hands on their heads. Photo: AP

Similar attacks, in Berlin, Nice, Brussels and Paris, have been carried out by militants over the past two years. In this picture police respond to reports of a van hitting pedestrians on London Bridge in central London. Photo: Getty Images

A police officer clears people away from the area near London Bridge. The incident bore similarities to a March attack on Westminster Bridge, west of London Bridge, in which a man killed five people after driving into a crowd of pedestrians before stabbing a police officer in the grounds of parliament. Photo: AP