Those rounded up include a local resident who dropped a cigarette butt at the spot few minutes before the explosion.
"Whether the blast took off due to the cigarette butt is yet to be established as we still don't know the exact composition of the explosive," a senior police officer said on Saturday, adding that forensic reports from the National Security Guard (NSG) and Forensic Science Laboratory (FSL) are still awaited.
He also said it is yet to be confirmed if the white powdery material found at the spot after the blast was industrial waste.
The police said they are yet to find any leads in the probe into the explosion.
According to the officer, over 50 people were spotted near the school in the CCTV footage of 10 days preceding the blast, but none of them have been identified as suspects.
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