Less than a full day into competition, the 2023 FIBA U18 European Championships are at risk due to unsafe playing conditions in Nis, Serbia.

Heavy rains and a lack of air conditioning resulted in a slippery floor that caused multiple injuries during Saturday's Group B opener between Turkey and Poland. After Poland's Jakub Szumert fell violently on a fast break, requiring immediate medical attention, players from both teams staged an impromptu boycott, going the last five minutes of the game without taking a shot.

Turkey beat Poland 78-63.

A leaking roof at a separate U18 venue caused another game to be postponed 30 minutes, but fortunately no players were injured before play was halted, according to ESPN's Jonathan Givony.

Video of on-court action showed multiple instances of players losing their footing.

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The FIBA U18 Euros tipped off on Saturday with group play. Spain defeated Turkey in last year's event championship game, and figures to have a good chance at repeating behind 7'3 center Aday Mara, a potential first-round pick in the 2024 NBA Draft.

Saturday's weather forecast in Nice called for heavy thunderstorms, strong gusts and a high temperature of 92 degrees fahrenheit. The Hydrometeorological Service of Serbia has issued Red Warnings for thunderstorms and extreme high temperatures, plus a yellow warning for wind, all lasting throughout Saturday into early Sunday morning.

There's been no official word from FIBA officials on the developing controversy.