The contractors who carried out repairs of the ill-fated suspension bridge at Morbi in Gujarat were not qualified to carry out such jobs, the prosecution told a court here.
While the bridge flooring was replaced, its cable was not replaced and it could not take the weight of the changed flooring, the prosecution, citing a forensic report, told the magistrate's court on Tuesday.
The collapse of the bridge on Sunday evening claimed 135 lives.
Chief Judicial Magistrate M J Khan remanded four of the arrested accused two managers of the OREVA Group and two sub-contractors who had repaired the bridge in police custody till Saturday.
The court remanded five other arrested men, including security guards and ticket booking clerks, in judicial custody as police did not seek their custody, prosecutor H S Panchal said.
Police had on Monday booked nine persons under Indian Penal Code Section 304 (culpable homicide not amounting to murder).
The four accused remanded in police custody were OREVA managers Dipak Parekh and Dinesh Dave, and repairing contractors Prakash Parmar and Devang Parmar, hired by the OREVA Group.
Citing a Forensic Science Laboratory (FSL) report, Panchal told the court that forensic experts believed the main cable of the bridge snapped because of the weight of the new flooring.
The court was also informed that both the repairing contractors were "not qualified" to carry out such a work.