Five workers were killed and two others badly injured last Friday when scaffolding collapsed at a Mexican highway project.
The accident occurred on 9 January during the construction of an overpass at the Atlixcáyotl Highway in the central Mexican city of Puebla. Authorities blamed "human error" for the accident, in which seven workers fell from a height of 18m.
A picture of the scene after the accident, which was posted on Twitter
The scaffolding, which was supported by a crane, is understood to have been unable to bear the weight of the men.
Three workers were pronounced dead at the scene and two others died at nearby hospitals.
The condition of the survivors is said to be serious.
Alfa Suppliers and Contractors, which hired the employees, issued a press release to say that it would "aid the families of the workers involved in the accident and will pay all the associated expenses", and would help the authorities with their investigations.
Corro Rodolfo Sanchez, the municipal comptroller who is investigating the accident, said it would take up to two months to determine the fine to be paid by Alfa Suppliers.