Additionally, 16 people were injured and two were in critical condition, the prefecture said. More than 200 passengers were on the train at the time of the crash, it added.
At around 7 a.m. (0500 GMT) near the town of Bully-les-Mines, a high-speed train travelling from Dunkirk to Paris collided with the truck, which was carrying military equipment, railway operator SNCF said in a separate statement.
SNCF said traffic had been interrupted and disruption was expected at least until the end of the day.
(Reporting by Inti Landauro and Sophie Louet; Editing by Sudip Kar-Gupta and Tomasz Janowski)

Investigators stand at the site of a collision of a TGV locomotive and a truck near Bully-les-Mines, between Bethune and Lens, in the Pas-de-Calais region, France, 07 April 2026. According to police, the TGV died in the accident. EPA/MAXPPP/LUDOVIC MAILLARD FRANCE OUT / BELGIUM OUT EDITORIAL USE ONLY/NO SALES/NO ARCHIVES