– One was a veteran police constable with the Metropolitan Police force in London. A second was a teacher who, according to reports, was walking from her school when she was mowed down by a sport utility vehicle on Westminster Bridge. Another was a man from Utah who was on vacation with his wife, celebrating their 25th anniversary.

They were all killed by an assailant who plowed through pedestrians on the bridge, crashed his vehicle into a fence and then emerged with knives, injuring at least 40 others in the heart of the city.

And a 75-year-old victim on the bridge died late Thursday of his wounds, police said.

Among the wounded, many of them foreign tourists, were 12 Britons, four South Koreans, three French high school students, two Romanians, two Greeks and one citizen each of China, Germany, Ireland, Italy and the United States.

The prime minister visited victims at a hospital in London for 40 minutes on Thursday, according to her office. Many of them had not been publicly identified. But information has dribbled out.

Police Constable Keith Palmer, 48, a 15-year member of the Parliamentary and Diplomatic Protection Command, was patrolling the Parliament building when the assailant fatally stabbed him. Tributes for Palmer have poured in.

Mayor Sadiq Khan said, "Keith Palmer was killed while bravely doing his duty — protecting our city and the heart of our democracy from those who want to destroy our way of life."

Kurt Cochran, an American traveling in Europe with his wife, Melissa Payne Cochran, died of injuries sustained in the attack, according to a statement from the family issued through the Church of Jesus Christ of Latter-day Saints in Salt Lake City. They were in Europe to celebrate their 25th wedding anniversary.

Cochran's wife was also wounded in the attack, and she was hospitalized with "a broken leg, a broken rib and a cut on her head," said her sister Sarah Payne-Mcfarlane in a post on Facebook.

The other victim was identified as Aysha Frade, 43, a British teacher who lived in London with her husband and two daughters. She taught Spanish not far from Westminster Bridge and was reportedly walking to pick up her children when she was killed, said the Spanish newspaper La Voz de Galicia.

New York Times