Mukaa Boys High School in Makueni has been closed indefinitely following student unrest that left a dormitory in ashes.
Police were earlier holding 12 students over the Saturday night incident that saw property worth hundreds of thousands destroyed.
Those arrested include six Form three, four Form two and two Form one students.
According to the Makueni County Police Commander, Joseph Ole Naipeyan, the students who are being held at Salama Police Station are helping in investigations.
Mr Naipeyan also revealed that that there was a second attempt to burn down a dormitory on Sunday at 6.30 pm where two cubicles were burnt and property of unknown value lost.
“The students are in police custody at Salama Police Station for interrogations in connection with the two consecutive day’s school fire incidents,” said the County Commander.
The inferno is said to have started at around 6 pm on the material day, destroying belongings of at least 100 students. Property including mattresses and books, were set ablaze.
No casualties were recorded as students and nearby area residents put out the fire. Firefighters arrived much later. before firefighters arrived.