Three boys aged eight, 10 and 11 have died after falling into an icy lake near Solihull on Sunday.
The boys were rushed to hospital after being pulled from the water, West Midlands Police said.
It is thought they had been playing on ice in Babbs Mill Park, in Kingshurst.
In a statement on Monday, police said the boys were unable to be revived and thoughts were with their family and friends. Specialist officers were helping the families.
A fourth boy, aged six, remains in a critical condition in hospital.