In his Sunday statement, Qassemi offered sympathy to the nation and government of the DR Congo and the bereaved families of the victims.
At least 50 people died after an oil tanker collided with a car on a major road in the west of the Democratic Republic of Congo.
The incident occurred near the city of Kisantu, between the capital Kinshasa and the port of Matadi.
One hundred people suffered second-degree burns, Atou Matabuana, the governor of Kongo Central region said.
“The flames spread rapidly engulfing nearby houses,” the UN’s Okapi radio reported.
Roads in the central African nation have often been neglected after years of war.
In 2010, 220 people were killed when an overturned oil tanker exploded and set fire to parts of a village in the country.