PESHAWAR, Pakistan — A suicide bomber in northwest Pakistan rammed his explosive-laden car into a vehicle Tuesday, killing five Chinese nationals and their Pakistani driver, police and government officials said.

The attack happened in Shangla, a district in Khyber Pakhtunkhwa province, local police chief Bakhat Zahir said. He added that the five killed were construction workers and engineers heading to the Dasu Dam, the biggest hydropower project in Pakistan, where they worked.

Authorities…