There were 67 people on board the train, which departed Stockholm Central station at 4.20am on May 27th, derailing 14 minutes later, injuring two people.
Public broadcaster SVT reports that there were known issues on the section of track where the train derailed, according to documents seen by its journalists.
A rail employee carrying out a routine inspection on the tracks two weeks prior to the incident wrote in a report on May 9th that they had discovered cracks in the junction where the derailment later occurred, SVT reports.
The police and the Swedish Accident Investigation Authority (Haverikommissionen) have both launched investigations into the incident.
“There were passengers and staff on the train when it derailed,” detective sergeant and leader of the investigation Robert Björk told SVT. “Everyone who was on the train was at risk of being injured.”
Arlanda Express trains have been cancelled since the incident, with repairs expected to last until around June 3rd.