![APTOPIX Britain Parliament Incident APTOPIX Britain Parliament Incident](https://api.time.com/wp-content/uploads/2017/03/london-attack-3.jpg?quality=85&w=2400)
By Alana Abramson and Andrew Katz
Britain’s parliament was on lockdown Wednesday after an attacker stabbed a police officer and was subsequently shot by police.
Around the same time on Westminster Bridge, near parliament, a vehicle struck several people, leaving one woman dead and several others with “catastrophic” injuries, officials said.
Until proven otherwise, London police are treating the incident as a terrorist attack, London Mayor Sadiq Khan said in a statement.
“The Metropolitan Police Service is dealing with the incident and urgent investigation is underway. My thoughts are with those affected and their families,” Khan said in his statement, which he posted on Twitter.
![Injured people are assisted after an incident on Westminster Bridge in London Injured people are assisted after an incident on Westminster Bridge in London](https://api.time.com/wp-content/uploads/2017/03/london-attack-1.jpg?quality=75&w=2400)
![A woman lies injured after a shotting incident on Westminster Bridge in London A woman lies injured after a shotting incident on Westminster Bridge in London](https://api.time.com/wp-content/uploads/2017/03/london-attack-2.jpg?quality=75&w=2400)
![APTOPIX Britain Parliament Incident APTOPIX Britain Parliament Incident](https://api.time.com/wp-content/uploads/2017/03/london-attack-3.jpg?quality=75&w=2400)
![Palace of Westminster incident Palace of Westminster incident](https://api.time.com/wp-content/uploads/2017/03/london-attack-4.jpg?quality=75&w=2400)
![A woman assist an injured person after an incident on Westminster Bridge in London A woman assist an injured person after an incident on Westminster Bridge in London](https://api.time.com/wp-content/uploads/2017/03/london-attack-5.jpg?quality=75&w=2400)
![Firearms Incident Takes Place Outside Parliament Firearms Incident Takes Place Outside Parliament](https://api.time.com/wp-content/uploads/2017/03/london-attack-6.jpg?quality=75&w=2400)
![Palace of Westminster incident Palace of Westminster incident](https://api.time.com/wp-content/uploads/2017/03/london-attack-7.jpg?quality=75&w=2400)
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Write to Alana Abramson at Alana.Abramson@time.com