51�Թ�

The BBC has spoken to eyewitnesses, including students who were in the hostel, along with friends of the trainee doctors who died and their teachers, to piece together what happened in those terrifying few seconds - and the aftermath that followed.

In the background, American law enforcers were working with counterparts in the UK to piece together their case against Hafeez, partly using evidence gathered from devices they had seized when they arrested Goswami and the Akasha brothers.

Detectives are continuing to piece together information about the days before Ms Zablocka's death.

“Scottsdale detectives and crime scene personnel will now conduct a thorough investigation to piece together what happened to Hannah and how she died,” according to the release.

Mr Davis said the FBI is still looking for the public's help to piece together the suspect's whereabouts before the blast, and will remain on scene for the next day or two to continue their investigation.