The bomb explosion at Malappuram Collectorate raised many questions among the investigation agencies.
The explosion has similarity with that of Kollam Collectorate ,earlier.
The officials are investigating the document and pen drive ,taken into custody from the spot.
No casualties have been reported in the incident.
The explosion occurred around noon time,today.
Meanwhile, the Indian Union Muslim League has demanded an independent probe to reveal the conspiracy behind the incident.
K.P.A.Majeed ,Kerala state general secretary of the IUML said in a statement that some hidden agenda might have worked out behind the explosion.
Somebody wanted to sabotage the peaceful environment in the district-he said.