A fire at a retirement home in northeastern Bosnia has killed at least 11 people and injured about 30 others, officials said.

It remained unclear what caused the blaze, which engulfed the seventh floor of the building in Tuzla, about 80km (50 miles) northeast of Sarajevo, after it broke out on Tuesday evening.

The fire, which took about an hour to bring under control, sent flames and smoke pouring out of the building into the night sky.

Bosnian media reported that higher floors in the complex were occupied by elderly people who could not move on their own or were ill.

“I had gone to bed when I heard a cracking sound. I don’t know if it was the windows in my room breaking,” resident Ruza Kajic told national broadcaster BHRT on Wednesday.

“I live on the third floor,” she said. “I looked

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