The men are suspecting of selling secret information to Beijing that included manuals for warships and their weapons systems, as well as blueprints for a radar system and plans for a huge US military exercise.
The security forces would provide a further layer of protection for the tankers in addition to the warships and planes operating in the strategically vital area, through which around a fifth of the world's oil passes.
The CPEC has brought billions of Chinese investments to Pakistan, establishing power plants, developing the strategically located deep-water Pakistani port of Gwadar on the Arabian Sea and building transport infrastructure, he mentioned.