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Firefighters are still working to put out deadly blaze at Sitakund near Chittagong.
Several nations had warned that Russia may trigger a false flag incident as a pretext to justify a military attack on Ukraine.
A Board of inquiry has been ordered to investigate into the cause of this incident.
Ten persons are injured and undergoing treatment, it is understood.
At least three houses collapsed in the explosion that occurred at 6.30 am.
The two sentenced are accused no 95 Poorayil Koyamon, alias Hydrosekutty (50), and accused no 148 Nizammudin (41).
Taliban interior ministry spokesman Qari Saeed Khosti said authorities were collecting details of the explosion, which took place days after a suicide bomb attack on a Shi'ite mosque in Kunduz.
There was no immediate claim for the blast in Kunduz province, but Islamic State militants have a long history of attacking Afghanistan's Shiite Muslim minority.
Thousands of Afghans have been gathered at the airport for days trying to flee the country since the Taliban takeover earlier this month. Western nations had warned of a possible attack.
The blast occurred at Chinispur village under Beru gram panchayat in Ketugram 1 block on Tuesday night.