Three males had been arrested beneath Britain’s Terrorism Act after a taxi exploded exterior a hospital in Liverpool, England, on Sunday morning, killing one individual and injuring one other, the authorities mentioned.

The reason for the explosion was not instantly clear. About eight hours after it was reported, the authorities announced that three males, aged 21, 26 and 29, had been arrested within the Kensington space of Liverpool. Their names weren’t instantly launched.

Counter Terrorism Policing North West, a part of a nationwide alliance of police forces, said it was leading the investigation with help from the Merseyside Police in Liverpool.

At about 11 a.m. native time, the police responded to studies {that a} taxi had pulled up exterior Liverpool Girls’s Hospital and exploded, the Merseyside Police said in a statement.

“Work continues to be ongoing to ascertain what has occurred and will take a while earlier than we’re able to verify something,” Chief Constable Serena Kennedy of the Merseyside Police told reporters on Sunday.

Ms. Kennedy mentioned the authorities had been “holding an open thoughts” as they investigated.

Given the circumstances of how the explosion occurred, she added, Britain’s Counter Terrorism Policing would lead the investigation. Britain’s house secretary, Priti Patel, said on Twitter that she was receiving common updates “on the terrible incident at Liverpool Girls’s Hospital.”

Prime Minister Boris Johnson posted a statement on Twitter on Sunday night time thanking the emergency providers for his or her response and the police for his or her ongoing work. “My ideas are with all these affected by the terrible incident in Liverpool in the present day,” he wrote.

The Higher Manchester Police mentioned on Sunday night time {that a} “massive cordon” had been positioned on Rutland Avenue in Liverpool, a couple of mile and a half from the hospital, and that a couple of houses had been evacuated as a precaution. The evacuation was a part of an investigation into the explosion, the police mentioned on Twitter.

It was unclear whether or not any of the three males who had been arrested lived on Rutland Avenue.

Details about the one that was killed within the explosion was not instantly obtainable.

A second sufferer, a person, was hospitalized with accidents that the authorities mentioned weren’t life-threatening. Phil Garrigan, the chief fireplace officer of the Merseyside Hearth and Rescue Service, informed reporters on Sunday that the person “had left the automobile previous to the fireplace growing to the extent that it did.”

The hearth from the explosion was extinguished rapidly, Chief Garrigan mentioned.

Entry to the hospital, the authorities mentioned, can be restricted “till additional discover,” and a few sufferers had been diverted to different hospitals. Ambulances had been nonetheless being allowed entry to the hospital for emergencies, and employees members had been being escorted into and out of the constructing by the authorities.

The mayor of Liverpool, Joanne Anderson, mentioned in a statement that “the incident on the Liverpool Girls’s Hospital is unsettling and upsetting and my ideas are with these affected.”

In a statement on Sunday night time, Ms. Kennedy mentioned that investigators had been nonetheless asking for info and that there can be “an elevated and visual police presence on the streets of Merseyside.”

“Additionally it is vital,” she mentioned, “that, at this very early stage, individuals don’t speculate about what has occurred.”

Jesus Jiménez contributed reporting.