"Statements of 14 persons associated with maintenance of the building have been recorded," Shankar Yerram, Police Inspector at Amboli police station, said.
"Among other things, we sought to know what exactly happened yesterday at the building and where did they spot the flames first," he added.
A police team also visited the site to understand the sequence of events that led to the blaze, the officer added.
Fire Brigade of the city civic body will also prepare a report on the incident. "We will also get this report, which will help us probe the matter thoroughly," said another officer.
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The firemen were later rescued from the site with the help of Navy and Coast Guard helicopters and rushed to Cooper hospital for treatment. The fire was extinguished after more than six hours.
The police have yesterday registered a case of accidental death over the fire incident after a firefighter, identified as Nitin Ivalekar (35) died due to suffocation.
Prima facie, there was no sabotage in the incident, police said.