Pakistani authorities will perform DNA testing on the remains of the suicide bomber who rammed his explosive-laden car into a vehicle in the country’s northwest, killing five Chinese nationals and their local driver, officials said Wednesday.

The attack occurred in Shangla, a district in the Khyber Pakhtunkhwa province where thousands of Chinese nationals work on the China-Pakistan Economic Corridor which includes a multitude of megaprojects such as road construction, power plants and agriculture. The CPEC is a lifeline for Pakistan’s cash-strapped government, currently facing one of its worst economic crises.