The deceased were identified as Arman Hossain, 28, son of Jahangir Alam of Ramchandrapur village, and Foyez Uddini, 15, son of Guljar Hossain of Bijoynagar village in the upazila.
Assistant sub-inspector of Begumganj Police Station Mizanur Rahman said the duo brought a gas cylinder along with them for fixing a refrigerator at a house of the village.
The cylinder went off with a big bang around noon, killing Arman on the spot and injuring Foyez, he said, adding that Foyez succumbed to his injuries on the way to hospital.
The bodies were sent to Sadar Hospital for autopsy, said Harunur Rashid, officer-in-charge of the police station.
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