Official said the explosives were found when security personnel searched the bus going from Noshki to Quetta, the capital of Balochistan province.
The five arrested persons were allegedly involved in smuggling the explosive materials, they said.
A bomb disposal squad was called in to check and defuse the explosives, officials said.
Islamabad: Pakistani law enforcement personnel said they had seized 4,000 kg of explosives from a bus and arrested five suspects on the outskirts of the southwestern city of Quetta on Sunday.
First Published: Sunday, December 02, 2012, 20:02