Security forces are reported to have seized 100 tonnes of bomb-making materials and detained 10 people in a raid on a warehouse in Quetta, south-west Pakistan.
Colonel Maqbool Shah of the Frontier Corps said the cache contained chemicals used to mix bombs, wires and detonating equipment.
He said they were the same type used in two attacks in the city earlier this year, in which more than 120 people were killed.
Earlier, the BBC reports, two men were arrested after being found driving a truck containing 15 tonnes of potassium chlorate.
No group was identified as owning the bomb-making equipment.