At least 15 students were killed at a girls' boarding school in central Kenya early Thursday, police officials said.

Authorities said an unknown number of students had also been injured.

The blaze broke out around 1 am at the Utumishi Girls' Academy Senior ‌School in the Gilgil area.

The cause of the fire was not immediately known.

"It is a distressing and saddening situation," county police official Masoud Mwinyi said addressing ​distraught parents outside the school, according to media reports.