Prosecutors in southern Brazil, where 235 people died when a fire ravaged the Kiss nightclub in Santa Maria last weekend, are investigating whether city leaders and inspectors were negligent in allowing the club to operate.

The investigation, which is separate from a criminal probe into the causes of the tragedy, comes after police said the club’s sole exit was partially blocked and that fire extinguishers and emergency exit lights weren’t working.

Investigators say the lapses led to the stampede and consequent trampling and suffocation that killed most of the fire’s victims.

“There is a political dimension to what happened,” Cesar Augusto Carlan, a public prosecutor for the state of Rio Grande do Sul, where the fire occurred, said in an interview yesterday. He said the investigation sought to determine what fault may lie with the city, fire inspectors, and any other enforcement officials who had allowed the nightclub to operate.

In a news conference late Tuesday, Santa Maria’s mayor, Cesar Schirmer, said city inspectors visited the club last April after it had undergone remodelling and found no reason to revoke its operating permit.

He said his mind was “at ease” that city hall had “fulfilled its obligation”.

Schirmer added: “The establishment, in our view, had no irregularities. If any measures or inspections should have been taken, that was the responsibility of the fire department.”

The local fire department, for its part, reiterated in a statement late Tuesday that it was in the process of renewing the club’s safety permit when the fire occurred, but that the establishment was authorised to operate in the meantime. It added, however, that the club appears to have committed several safety violations, noting that it did not have a permit allowing the sort of pyrotechnics that sparked the fire and that regulations require that the exit remain unobstructed, which wasn’t the case.

“If there had been a request to use pyrotechnics in the nightclub Kiss, the fire department would not have authorized it,” the statement read.

Further details of the tragedy continue to emerge.

Police said one of the club’s owners, who with his co-owner is in police custody for questioning, on Tuesday tried to choke himself with a shower hose at a local hospital in a suicide attempt.

The owner, identified by police as Elissandro Spohr, told officials he could not bear the strain of the tragedy.