Three people, including the bus driver suffered minor injuries. Other eight pupils were not injured.
Both drivers have been taken in for questioning, the newspaper reported, quoting province prosecutor Isabelle Pagenelle. The test for alcohol showed negative results, while toxicological examination is not finished yet.
One version of the accident suggests sudden opening of truck's side gate which sliced through the side of the bus coming the other way. The children who were on that side of the bus died.
According to investigators, the driver of the truck says that before the accident he called to a gas station and did not notice anything suspicious.