People across the globe showed solidarity with the victims of Wednesday’s deadly terror attack in London.

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Police said four people, including the suspected attacker, were killed and more than 40 people were injured Wednesday afternoon in the attack outside the British Parliament building.

Among those killed was the suspected assailant, identified by police as 53-year-old Briton Khalid Masood. Authorities said Masood slammed a vehicle into people on Westminster Bridge before attacking Keith Palmer, a police officer who was guarding Parliament.

American Keith W. Cochran, who was visiting London to celebrate his 25th wedding anniversary, and English teacher Aysha Frade, 43, were also killed.

The flag above Scotland Yard, the headquarters for London's Metropolitan Police Service, was flown at half-mast in remembrance of the victims.