In pictures: London Bridge attack aftermathReutersPolice arrested 12 people in Barking on Sunday after seven people were killed and 48 were injured in London Bridge and Borough Market on Saturday evening.ReutersAreas of central London remained cordoned off after Saturday's terror attack.EPAMembers of the Muslim community paid their respects to the victims with tributes near London Bridge.Getty ImagesCounter-terrorism officers are patrolling near the scene.Getty ImagesArmed officers have also been checking out the nearby Shard, Britain's tallest building.ReutersPolice are patrolling the River Thames.EPAMessages of love and sympathy are being spread across the capital.AFPForensics officers are working across the area.ReutersThey collected pieces of evidence to help with the investigation.ReutersSniffer dogs are also being used to find clues.ReutersUnion flags on Downing Street flew at half-mast on Sunday.PAOn Saturday night, police responded after reports of a van hitting several people on the bridge.Getty ImagesThe surrounding area was quickly closed to the public.ReutersPolice locked down nearby Borough Market - known for its restaurants and bars - where several of the victims were stabbed.Gabriele SciottoOne social media user published a picture of a man on the ground with what appeared to be canisters strapped to his body. These explosive vests were later confirmed to be hoaxes.AFP/GettySome injured people were treated at the scene - 48 people, some critical, are being treated in hospitals.Reuters Facebook activated a safety check so people could let friends and family know they were safe.Latest updates: London attackSeven killed in London terror attack