The Bajaur Agency political administration seized the explosives soon after it entered the agency near the border with Lower Dir district in Khyber Pakhtunkhwa province.
Assistant political agent Khar Muhammad Ali Khan told reporters that security officials stopped the truck near a border checkpost and seized 100 bags filled with explosives.
He said the bags contained different sorts of explosives.
The official claimed that the explosives were being smuggled from Lower Dir to Bajaur to carry out terror attacks.
Efforts were underway to arrest those responsible for shipping the explosives to the agency.
Security in the province has been tightened since the attack on Bacha Khan University (BKU) near provincial capital Peshawar on January 20, when Taliban militants breached the varsity complex and shot dead 21 people, including students.