A 13-year-old boy who allegedly admitted to killing his nephews, aged 4 and 8, by pushing them into an irrigation canal in Ilia in the Peloponnese on Wednesday, is being examined by a psychologist before a prosecutor determines whether he will face criminal charges.

The 13-year-old, whose sister was the mother of the two boys, allegedly said that he had been jealous of them because they received more attention than he did from the family. He is said to have admitted that his sister sent him in search of the siblings who were late returning from an errand, when he came across them beside the canal. He allegedly pushed the 8-year-old into the canal first and then tried to shove the smaller boy in as well. According to police, the 4-year-old clung onto a shirt tied around his uncle’s waist before falling into the water, where both he and his brother drowned.

The shirt was found near the boys’ bodies on Thursday, raising suspicions of foul play.