Gunmen on a motorbike opened fire on a car carrying two Chinese workers in Pakistan's port city of Karachi on July 28, wounding them before fleeing the scene.
Police officer Fida Hussain Jauhari told RFE/RL's Radio Mashaal that a third person in the vehicle appeared to be unharmed.
Police say the motive behind the attack was not immediately clear.
An initial police report said one of the Chinese men -- listed in serious condition with three gunshot wounds -- was a nuclear engineer working at the Karachi Nuclear Power Plant.
But a later police report identified both Chinese men as "factory workers," omitting the reference to the nuclear power plant.
The Karachi nuclear plant has been undergoing an expansion since 2015 under a $10 billion project financed by China -- the biggest energy and infrastructure investor in Pakistan. Two new nuclear reactors there are scheduled to go online in 2021 and 2022.
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Karachi is the capital of Pakistan's southern Sindh Province, also is home to several other Chinese-funded construction projects.
The incident comes weeks after a bus carrying 40 Chinese workers fell into a ravine in northwest Pakistan, killing nine Chinese and three Pakistanis.
Pakistani Foreign Ministry initially had said the accident occurred after a mechanical failure, resulting in "the leakage of gas that caused a blast."
But investigators later concluded that the bus driver had lost control after a suicide car bomber set off his explosives prematurely nearby.
The attack took place in Upper Kohistan, a district in the Khyber Pakhtunkhwa province that borders restive Afghanistan.
China has invested billions of dollars into Pakistan in recent years, but Chinese-funded projects have triggered discontent among some separatist groups who say local communities benefit little from the projects.