AKIPRESS.COM - A 19-year-old man attacked several people with a knife in central London Wednesday evening, killing an elderly woman and injuring five other people, as police said they could not rule out a terror attack, Fox News reported.

Metropolitan Police spokesman Mark Rowley told reporters that the suspect's "mental health is a significant factor in this case," but added that terrorism "remains one line of inquiry for us to explore."

"At this stage, we should keep an open mind regarding motive," Rowley added.

Officers were called to Russell Square for a report of a man with a knife at around 10:30 p.m. local time. (5:30 p.m. ET). Rowley said the woman who died was in her 60s. Another woman and four men were injured.

The suspect was arrested after police deployed a Taser. The conditions of the injured victims were not immediately clear. Neither the suspect nor the victims were immediately identified.

Early Thursday, the Metropolitan Police's homicide unit was leading the investigation, with assistance from counterterror officers.