The country’s state railway company have since echoed the claim that a Russian airstrike hit an area near the station from which thousands are attempting to flee the conflict.
An AFP journalist also saw a column of smoke rising in the distance, but was unable to get there due to a night curfew which is in effect until 0500 GMT. Explosions are sometimes caused by air defence weaponry.
Iraqi authorities announced on Tuesday that at least four people were killed and 20 people were wounded in an explosion in the city of Basra in southern Iraq.
The powerful blast destroyed the HBL bank building. Video footage aired by local television stations showed the entire structure of the Shershah branch was damaged. The floor was blown out and furniture was mired in sewage from below. The impact of the blast damaged several cars parked nearby and threw debris onto a gas station on the other side of the building.
Videos circulating on social media showed a powerful explosion, followed by the appearance of a ball of fire that rose to a great height.
The blast did not look like an accident, emergency responders said. Sweden has suffered dozens of actual or attempted bombings linked to violent criminal gangs in recent years.
It said five of the building's 73 apartments were damaged and that 173 residents had been evacuated. Russian news agencies reported earlier that two children were among the injured.
Shahabul Haque Shabu, officer-in-charge of Dhaka's New Market Police Station, told reporters on Sunday that the victims were found at the office where a raging fire and explosion erupted Sunday morning.
The identity of the other deceased could not be confirmed yet. Among the six deceased, a man was killed after being hit by a metal object that fell on him at Kadamrasul Bazar, about a kilometre away from the spot.