Four months after a metro accident in Mexico City with 26 dead, investigators have attributed the accident to construction errors.
The collapse of the metro bridge was caused by defective beams and bolts, the Norwegian engineering company DNV announced on Tuesday (local time).
She was commissioned by the authorities in May to look for the cause of the accident and has now submitted her final report.
According to their own statements, the experts found deformations in the beams of the collapsed subway section.
Badly welded, missing and incorrectly installed bolts would have destabilized parts of the construction.
This led to cracks that further reduced the stability of the bridge.
On May 3, a twelve-meter-high subway bridge on line 12 collapsed in the impoverished Tláhuac district of the Mexican capital when a subway was passing over it.
26 people were killed and dozens more injured.
After the disaster, there were angry protests in Mexico City.