(CNN) — Update: Police say that the woman who was killed was an American named Darlene Horton, 64. Police in London say the deadly knife attack wasn’t terrorism.
Investigators say the Wednesday night attack appears to have been “triggered by mental-health issues.”
Update: The woman who was killed was in her 60’s. Another woman and four other men were injured. Police are still investigating a motive, but they have not ruled out terrorism.
Police say that London will have more police on the streets as a precaution on Thursday.
Original: One person was killed and five others were injured in a knife attack in central London’s Russell Square, London Metropolitan Police said.