Hundreds of people joined together on Westminster Bridge Wednesday to remember the four killed in last week's London attack.

A large crowd, which included police, hospital staff and relatives of victims, stretched across the bridge where Khalid Masood drove a car into pedestrians March 22.

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A police officer holds a flower as he joins the march on Westminster Bridge. Londoners gathered holding signs with slogans such as 'Love for all, hatred for none.' (Stefan Wermuth/Reuters)

Masood went on to fatally stab a policeman before being shot dead on the grounds of Britain's Parliament. 

Emotional family members of U.S. tourist Kurt Cochran, who was killed in the assault, gathered at the bridge to lay flowers.

Cochran and his wife Melissa were in Europe to celebrate their 25th wedding anniversary and had been due to return to the United States the day after the attack took place. Cochran's wife suffered a broken leg and rib and a cut to her head.

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A police officer wipes her face as she holds a rose during the event, where police and the public came together. (Hannah McKay/Reuters)

The crowd included members of the Islamic charity organization Ahmadiyya Muslim Youth Association, who held up banners reading "Love for all, hatred for none."

As well as the four dead, more than 35 people were injured in the attack.

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People hold hands on the bridge while paying tribute to the victims of the March 22 attack. (Stefan Wermuth/Reuters)