Four teenagers are being held by police after a fire at a shop in Peterborough.
The emergency services were called to the Fletton Stores on Fletton High Street at about 0230 BST on Thursday.
Police and fire crews were sent to the scene and four people were rescued. No-one was injured in the fire. The shop was sealed off by police.
Cambridgeshire Police arrested the four teenagers on suspicion of arson at about 0450 BST. They are two 18-year-old men and two girls aged 17 and 16.
They are being held at Thorpe Wood Police Station on suspicion of criminal damage arson and are expected to be questioned throughout the day.