"The incident should be properly probed to unearth the truth and those who are responsible for such heinous act should be given exemplary punishment," Left Front chairman Biman Bose said.
The fire also gutted around 700 shanties in the area, but no injuries or casualties were reported.
West Bengal Chief Minister Mamata Banerjee had termed the incident as "a small incident" and promised rehabilitation of the victims.
West Bengal state Congress Pradip Bhattacharjee also demanded a probe into the incident.
"We want the incident to be probed. Our leader and MP Deepa Dasmunsi had visited the spot today and given us a horrific report about the incident. How can the chief minister term it as an small incident, " Bhattacharjee wondered.
The police filed an FIR against 11 persons, including Trinamool Congress councillor of Mahestala Municipality Dipika Dutta and TMC leader Rafiq Mollah.
Of the 11, five were arrested, police sources said.
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