The American woman killed in a central London knife attack that left five others injured has been identified.

The Tallahassee Democrat reported that 60-year-old Darlene Horton was the sole fatality in the Wednesday night incident. She was married to Florida State University psychology professor Richard Wagner who was leading a summer study programme in London, which had just concluded.

Both Ms Horton and Mr Wagner were scheduled to return to the US on Thursday. Students in the programme had already flown back home.

The FSU London Study Centre is only a few blocks away from Russell Square, where the attack took place.

Russell Square attack: Woman killed in London was American citizen

“There are no words to express our heartache over this terrible tragedy,” said FSU President John Thrasher. “We are shocked that such senseless violence has touched our own FSU family, and we will do all we can do assist Professor Wagner and his loved ones, as well as his friends and colleagues in the Psychology department, as they mourn.”

Ms Horton sustained multiple knife wounds to the back. Prior to her death, witnesses said that her final words were, “He’s still here, he’s still here”, in reference to the attacker.

In pictures: Russell Square stabbing Show all 6 1 /6 In pictures: Russell Square stabbing In pictures: Russell Square stabbing A police forensic officer at work in Russell Square, central London, after a knife attack in which a woman in her 60s was killed and five people were injured. PA In pictures: Russell Square stabbing A police forensic officer at the scene in Russell Square, central London PA In pictures: Russell Square stabbing A private ambulance leaves Russell Square in London early on August 4, 2016, after a woman in her 60s was killed during a knife attack AFP/Getty Images In pictures: Russell Square stabbing Police at the scene of a stabbing attack in Russell Square in central London on August 4, 2016 AFP/Getty Images In pictures: Russell Square stabbing A police officer lays flowers left by a member of the public close to the scene where one women died and several people were injured in a knife attack in Russell Square EPA In pictures: Russell Square stabbing The police cordon Russell Square in central London on August 4, 2016, AFP/Getty Images

One victim from London sustained a stabbing wound to the stomach. He is listed in critical but stable condition. The four other victims – an Israeli woman, an Australian man and woman, and American man – have been released from the hospital.

Metropolitan Police apprehended the 19-year-old knifeman before 11 pm in London after the arresting officer deployed a Taser.