Police have named the man behind the Liverpool Women’s Hospital blast.
Emad Al Swealmeen was identified as the person who died when a homemade bomb exploded outside the hospital’s entrance last weekend.
The 32-year-old had been the passenger in a taxi that arrived at the city’s specialist neonatal facility shortly before 11am on Remembrance Sunday.
David Perry, the driver of the private hire taxi, escaped from the vehicle before it caught fire with injuries but has since been discharged from hospital.
Detectives believe that Al Swealmeen lived in nearby Kensington, where four men were arrested under the Terrorism Act within hours of the incident.
All four have since been released from custody without charge.
Assistant Chief Constable Russ Jackson, from Counter Terrorism North West, said: “The investigation continues to move at a fast pace with investigative teams working throughout the night.
“We have made significant progress since Sunday morning and have a much greater understanding of the component parts of the device, how they were obtained and how the parts are likely to have been assembled.
“We have also recovered important evidence from the address at Rutland Avenue which is becoming central to the investigation.
“There is a considerable way to go to understand how this incident was planned, prepared for and how it happened.
“We are gaining a better understanding by the hour but it is likely to be some time, perhaps many weeks until we are confident on our understanding of what has taken place.
“In the meantime, we have considerable resources and staff deployed to understand how this device was built and who if anyone else was involved.
“If the evidence takes us to the involvement of others, further arrests will quickly take place.”
Anyone who has any information should call on 0161 856 1027 quoting Liverpool Womens Hospital incident.
Details can be passed to the independent charity Crimestoppers anonymously on 0800 555 111.