On Monday evening, two toddlers were abandoned at the Plopsaqua water park's outdoor swimming pool, in the Walloon municipality of Hannut.
"One of our stewards had noticed some movement on a pile of bags," Plopsaqua's general manager, Steve van den Kerkhof, told Belga News Agency.
What they discovered was a six month-old infant and a one and a half year-old child.
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Following that, the police and emergency services were contacted, and both children were taken to the hospital.
The parents have subsequently been located and arrested, according to Manu Douette, mayor of Hannut.