A Herald journalist has described the "distressing" and dramatic scenes in central London.
Business Herald online editor Sophie Ryan is holidaying in London and is close to the scene of the incidents in the London Bridge area.
"Traffic is extremely heavy in the London inner city, with emergency services driving through with sirens and lights every other minute. All roads towards to the scene of the incident have been closed and dozens of armed police are guarding the roads.
"Police helicopters are circling above the inner city of London. The scene is very distressing and London seems incredibly grim tonight after a brilliant summer's day."
Hundreds of people were gathered outside underground stations three kilometres from the scene of the attacks.