Ten cartons with 250 kg of explosives, 1,000 live detonators were found, police said.
Six person were arrested in Meghalaya's East Jaintia Hills district with a huge quantity of explosives and detonators, police said on Friday.
Acting on a tip-off about possible movement of explosives, police conducted raids in the 4 Kilo area on Wednesday night, they said.
An SUV with Assam registration was intercepted at Kongong in the Ladrymbai police outpost area, police said.
Ten cartons with 250 kg of explosives (2,000 gelatin sticks), 1,000 live detonators and eight rolls of fuse were found in the car, said Assistant Inspector General of Police GK Iangrai.
Six person were arrested during the operation in Meghalaya's East Jaintia Hills district, police said.
Two persons who were travelling in the vehicle were arrested, he said.
Based on the information obtained from them, four more persons were arrested, leading to a hideout in the 5 Kilo area in Khliehriat where the explosives were suspected to have been loaded in the vehicle, he added.
On search of the place, 51 cartons with approximately 1,275 kg of explosive (10,200 gelatine sticks), 5,000 detonators and eight rolls of fuse were seized.
"Altogether 1,525 kg of explosives were seized in the operation," Mr Iangrai said.
A case has been registered under the Explosives Act and other relevant sections, he said, adding that an investigation is underway.