Parts of the country have been experiencing a heatwave since Mar 31, making it the longest spate of such weather on record
The incident happened near Jadukata River at the Upazila’s Uttar Borodol Union on Thursday evening.
The deceased are Abdur Razzak, 26, Jamal Uddin, 32, and Al Amin, 27.
The injured could not be immediately identified.
Uttor Borodol Union’s Chairman Jamal Uddin said the workers were collecting coal from the Jadukata River when the lightning struck.
They were killed on the spot.