Three men have been arrested on suspicion of manslaughter, including one from the North West, following an explosion in Leicester.
Leicestershire Police said the men, all in their 30s, were arrested by officers on Wednesday evening, and were being questioned by detectives.
The force say that those in custody are from the North West, the East Midlands and East Anglia.
The arrests are in connection with the investigation into a huge blast in Hinckley Road which demolished a supermarket and the two storey flat above, killing five people on Sunday night.
Human remains were recovered from the rubble which threw debris across four lanes of traffic and sparked a large fire.
Still officially listed among the missing are Mary Ragoobeer, 46, and her sons Shane, 18, and Sean, 17.
Also unaccounted for are Shane's girlfriend Leah Beth Reek, also 18, and 22-year-old shop worker Viktorija Ijevleva.
Remains recovered from the wreckage have yet to be formally identified.