Three weeks after the fire in a bus depot in Stuttgart, the investigators and experts examined an electric bus up close, which is the focus of the investigations.
Measurements had been made, said a police spokesman on Thursday.
The data would have to be evaluated.
So far, the burned-out hall was considered to be in danger of collapsing.
Stuttgart - It was initially unclear when the vehicle would be pulled out of the hall.
The focus of the investigations is a bus with solid-state batteries.
According to an initial assessment by the police, the fire could have been triggered while charging an electric bus.
The investigators came to this conclusion after checking the data from the fire alarm system and the associated temperature sensors.
A technical defect is therefore currently assumed to be the cause of the fire.
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The search for the cause of the fire in a bus depot in Stuttgart will only be able to start in a few days.
Investigators and experts could not yet enter the hall concerned, said the police and Stuttgarter Straßenbahnen AG (SSB) on Monday when asked.
Structural engineers would first have to approve the site.
Fire in Stuttgart bus depot: cause still unclear
The police are focusing their investigation on the battery of the bus.
A sensor above the electric bus had struck.
According to a witness, his batteries were burning on the roof.
Among other things, comparative measurements are now planned for buses of identical construction.
The major fire on the evening of September 30th completely destroyed 25 buses, including two with electric drives.
The property damage runs into the millions.
dpa
