British police say an explosion in a taxi outside a hospital, which killed a man, is being treated as a terrorist incident.
Russ Jackson, the head of Counterterrorism Policing in northwest England, said the blast at the Liverpool Women's Hospital involved an improvised explosive device.
He said "enquiries will now continue to seek to understand how the device was built, the motivation for the incident and to understand if anyone else was involved in it."
The male passenger in the taxi died in the explosion, and the taxi driver whose actions have been praised, was injured.
Three men in their 20s have been arrested under the Terrorism Act.
Suspicions were aroused by the timing of the explosion - just before 11am on Remembrance Sunday, the moment people across Britain hold services in memory of those killed in wars.
Liverpool's mayor Joanne Anderson said the taxi driver locked the doors of his cab so the passenger couldn't leave.
"The taxi driver, in his heroic efforts, has managed to avert what could have been an absolutely awful disaster at the hospital," she told the BBC.
Britain's interior minister, Home Secretary Priti Patel, said she was "being kept regularly updated on the awful incident."