It has been a month since the Bank of Lisbon building caught alight and killed three firefighters but the cause of the fire is a mystery. Picture: Twitter

Johannesburg -  It has been a month since the Bank of Lisbon building caught alight and claimed the lives of three firefighters but the cause of the fire remains a mystery.

On Wednesday the Johannesburg Emergency services (EMS) said they were still investigating the cause of the fire at the 23-storey building.

EMS spokesperson Nana Radebe said: “The investigation is still continuing and we are waiting for some reports, once we have them we will release a statement ”.

She did not say when the report would be complete.

Africa News Agency (ANA)