A total 24 detonators were seized from north Sikkim by police from the roadside between Toong and Reychu highway, police said on Thursday.
The detonators were found by patrolling policemen on Monday, Deputy Inspector General of Police, Range, Akshaya Sachdeva said.
The seizure closely followed the recovery of a powerful improvised explosive device in south Sikkim.
Sachdeva said it was suspected that the detonators were thrown off a vehicle by its owner who might have become frightened with intensified patrolling on the highway, he said.
A case under the Explosive Substances Act has been registered in connection with the seizure of the detonators and an investigation launched to find out as to whom the haul of explosive materials belonged to, Sachdeva said.
Meanwhile, the security at public places and Durga puja pandals in Gangtok and elsewhere in the state have been tightened and the local police directed to monitor day-to-day security measures in view of the growing incidents of subversive activities across the country, he said.