The man, who was travelling from neighbouring Arunachal Pradesh, was apprehended with the suspected explosives from an Assam State Transport Corporation bus at about 7.45 am during routine check at Jagun.
The man was identified to be a resident of Yanman in Changlang district of Arunachal Pradesh and was travelling from Miao when he was nabbed, the police said.
Investigations are on, the police added.