An 11-year-old boy has been arrested on suspicion of raping a 7-year-old boy.
Officers arrested the older child after the alleged victim's family said he had been attacked in Wool, a village in Dorset.
The seven-year-old's mother said her son had disappeared from view while playing outside on Monday evening.
She said when he returned a short while later, his clothes were in disarray and he seemed subdued.
Upon questioning, the boy told his parents he had been raped.
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The mother said her 'normally lively' son had been badly traumatised and was now quiet and withdrawn.
Dorset Police said "We are investigating a report of a rape in Wool.
"It was reported that the incident occurred on Monday, May 14, at an outside location.
"The victim, a seven-year-old boy, is being supported by specially-trained officers.
"An 11-year-old boy was arrested on suspicion of rape and has been released under investigation to allow officers to establish the full circumstances around the incident."