Police said firefighters came to the scene within minutes of being alerted but that the apartment was already engulfed in fire.
13 HOSPITALIZED AFTER FIRE ERUPTS AT HONG KONG'S WORLD TRADE CENTER
People look at a residential building after a response team extinguished an apartment fire in Novi Pazar, Serbia, on March 5, 2023. (Davud Bihorac/Anadolu Agency via Getty Images)
Firefighters found all the children in one room. They apparently died of carbon monoxide poisoning, a statement said.
The parents were in another room and have been hospitalized, police said. The Novosti newspaper reported they suffered severe burns.
It was not immediately clear what caused the fire.
"Although the firefighters reacted swiftly and arrived at the scene, it seems that the fire had erupted much earlier because it was in an advanced stage," police said.