Dhaka/UNI: The Directorate of Secondary and Higher Education announced that the classes of all secondary schools in Bangladesh will remain closed on Thursday, due to the heatwave.

The director general of secondary and higher education directorate professor Nehal Ahmed confirmed the matter on Wednesday.

Earlier, all primary schools were closed for four days -- between 5 June and 8 June -- to protect the children from the searing heat.

Meanwhile, on Wednesday, 26 students of three secondary schools at Daudkundi in Cumilla fell sick while attending the half-yearly examination.

Of them, 23 students were admitted to the Daudkandi upazila health complex for treatment.