Police said investigations are continuing into the major fire in Glasgow, which was started when thugs set a pile of rubbish ablaze.
Emergency services had to create an exclusion zone around the blaze at the Tesco store in Shettleston.
The fire was reported at 1.15pm on Wednesday after the flames spread to the store's electrical units and caused an explosion.
Detectives said the blaze caused more than £700,000 worth of damage and are now hunting for those responsible.
The rubbish had been piled up against a fence behind the Tesco store, between Old Shettleston Road and Cockenzie Street.
Scores of homes in the area were also left without power after the blast.
Police believe a group of schoolchildren who were spotted near the scene, may hold clues about the fire.Detective Sergeant Colin MacRitchie, Shettleston CID, said: "Our enquiries so far have established that there were a number of pupils from a nearby school, in the lane at the time, during their lunch break.
"They may have seen someone setting the fire or acting suspiciously."
DS MacRitchie added: "On this occasion, no one was hurt, however, a number of homes in the area were without power for two hours as a result of this reckless act."
He said the fire caused hundreds of thousands of pounds worth of damage.