Flags were flying at half-mast as two further deaths were recorded, up from the initial death toll of 58 people earlier, the government said in a statement.
The explosion near a petrol station in the capital, Niamey, happened in the early hours of Monday as some residents were trying to siphon fuel from a tanker that had overturned near the airport.
At least 37 people were injured, some seriously, and brought to hospitals.
The cause of the accident remained under investigation on Wednesday. (dpa/NAN)
