"A very low intensity IED was used to trigger the blast", Director General of Police Loknath Behera told PTI.
Asked if Kerala police was viewing it a a terrorist act, the DGP said some pamphlets and a picture of al-Qaeda leader Osama-Bin Laden had been recovered from the spot.
Behera said had also spoken to a central agency.
The blast was similar to the one at the court premises at Chittoor on April 7 in Andhra Pradesh and Mysuru in Karnataka on August 1, he said.
Malappuram District Police chief Debesh Kumar Behera said that as the blast occurred, there was a smell of ammonium in the air.
A small cardboard box with the words 'The Base Movement' on top was also recovered by police from the spot.
(REOPEN MDS11)
Malappuram district police sources said some steel pieces were found near the blast site and it is suspected that a 'Pressure cooker' was used to trigger it.
A special team has also been constituted to probe the blast.
The probe would be conducted with the assistance of a Central agency in the backdrop of similar blasts in the Kollam Collectorate complex and in Mysore and Chittor in Andhar Pradesh recently, he said.
A speical Intelligence Team and a special team of state police have been deployed in the area, he added.
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