A prayer service has been held to remember the victims of two explosions which destroyed a wood mill in Bosley in Cheshire a week ago.
Four people were left unaccounted for following the blast. Fire and rescue teams have found three bodies so far.
The Bosley mill incident which has killed at least three people is the worst rescue crews have seen for a decade.
Paul Hitchen, from Urban Search and Rescue, said: "The scale of the incident is unprecedented in this country in the last 10 years.
"It's extremely dangerous and arduous for the rescuers. There's a massive amount of metal, concrete and brickwork which we need to move to continue the search.
"The priority is the rescue of the casualties. It's not possible to say yet when we will find the fourth body."
An emotional prayer service has been held to remember the victims of the Bosley mill explosion, a week on from the disaster.
Kelvin Barks told ITV News his brother William, who was an engineer at the factory, tried to get a new job but 'had bills to pay'.
Dorothy Bailey, Derek Moore, Jason Shingler and William Barks have been missing since Friday's explosions.