In Moulvibazar, two minor sisters died after a thunderbolt struck them at Patanushar village in Kaliganj upazila.
The deceased were identified as Sadia Akhter, 6 and Munni Akhter, 4, daughters of Junayed Mia of the village.
The thunderbolt hit them around 9:30 am when the siblings were playing at their courtyard, leaving them severely injured, according to locals.
The injured were rushed to Moulvibazar 250-bed hospital where doctor declared them dead.
In Kishoreganj, a young farmer named Rabbi Mia died after being hit by a thunderbolt around 11:30 am at Nandirhat village in Itna upazila.
A thunderbolt struck him while he was cutting grassl, said officer-in-charge of Itna Police Station Md Morshed Zaman.
In Habiganj, Abdul Hamid, 60, son of Nimar Ali, was killed after being struck by lightning at Montail village in Lakhai upazila.