The boys are aged between 12 and 15.
Three boys arrested following a fire at a derelict building in Wigston have been released on police bail.
The boys aged 12, 14 and 15 were arrested on suspicion of arson.
Leicestershire Police were called to the scene in Launceston Road by the fire service at 5.25 pm on Friday 31st of March.
Officers are now working to establish how the fire started.
The road was closed while the fire was put out but it has since been reopened.
A cordon remains in place at the scene while an investigation is underway.
Anyone with information relating to the fire is asked to call police on 101 or report online, quoting crime reference number 23*183623.