He did not explain why they were carrying the firearms.
"The reason will be known after interrogating them. They have been shifted to an unidentified place," he said.
A police source said that the Chinese were carrying the weapons for "self-defence".
"Two elite force vehicles were along with the Chinese in question when they were detained by the army," the source said, adding that the weapons recovered from them include a telescope gun, a pistol, a pump action and scores of bullets.
More than 7,000 personnel of the special police force in Punjab province are providing security to Chinese nationals.
The CPEC is a flagship project of Chinese President Xi Jinping's Belt and Road Initiative (BRI).
The 3,000-km-long CPEC is aimed at connecting China and Pakistan with rail, road, pipelines and optical cable fiber network. It connects China's Xinjiang province with Pakistan's Gwadar port, providing access to China to the Arabian Sea.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)