"I should stress that on the possible killing of the two Chinese nationals, we express high concern. But so far, Pakistan has not confirmed the information to China," Chinese Foreign Ministry spokesman Lu Kang told media briefing here.
"We are intensifying the efforts to verify the relevant information," he said.
The Ministry's response came after China's official media yesterday accused South Korean Christian groups and intelligence agencies of recruiting young Chinese and sending them for proselytising in Muslim countries.
Chinese Foreign Ministry on June 9 said Beijing was informed by Pakistan officials that a Chinese man and a woman identified as Lee Zingyang, 24, and Meng Lisi, 26, who were kidnapped last month from Quetta may have been killed.
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The video of their killing emerged on the eve of the Shanghai Cooperation Organisation (SCO) summit in Astana which was attended by Chinese President Xi Jinping and Pakistan Prime Minister Nawaz Sharif.
Subsequently, Pakistan Interior Ministry said the two Chinese nationals were involved in "preaching" in the country along with a Korean group.
About the allegations that they were preachers, Lu said, "We always require the Chinese citizens to abide by local laws and regulations while travelling and living in foreign countries, respect the customs of the local people and stay alert to protect their safety and security."
"On the information of possible preaching by the two people we will cooperate with Pakistan to investigate for further information," he said.
Pakistan has been grappling with Islamist and nationalist insurgencies in Balochistan since 2004, with hundreds of soldiers and militants killed in the fighting.