ISIS has abducted and killed two Chinese nationals living in Pakistan, the terror group claimed.

China and Pakistan said on Friday that they were investigating the claim after a video appearing to show the pair was sent to journalists.

The two victims have been described as teachers and were said to be a couple.

The two Chinese nationals have been identified as Li Xinheng (left) and Lu Ling Lina by the Pakistani Police, who provided the pictures to the European Pressphoto Agency (EPA)

A Pakistani man was injured while trying to help the two Chinese nationals from being abducted. The man is pictured receiving medical treatment at a hospital in Quetta

Chinese Foreign Ministry spokeswoman Hua Chunying told the official Xinhua News Agency on Friday that the government was seeking information from Pakistani authorities.

'We have taken note of relevant reports and we express our grave concern. We have been trying to rescue the two kidnapped hostages over the past days,' Hua was quoted as saying.

She added: 'The Chinese side is working to learn about and verify relevant information through various channels, including working with Pakistani authorities.'

Hua also stressed that China opposes terrorism and extreme violence in any form.

In Islamabad, two Pakistani security officials said they were investigating the claim, but no bodies have been found.

Chinese Foreign Ministry spokeswoman Hua Chunying (pictured) said Beijing expressed 'grave concern' over the reports. The Chinese authorities are investigating into the claim

Earlier Friday, a 24-second video was sent to the phones of journalists working in Baluchistan - apparently by the Islamic State group.

The footage appeared to show the bloodied bodies of a Chinese man and woman.

Pakistani officials speaking to Associated Press on routine condition of anonymity said they were aware of the video but the bodies had not been found or their identities verified.

It's believed that the two victims were teachers at a private language school.

They were kidnapped on May 24 by gunmen dressed as police who stopped their car in Quetta, the capital of Baluchistan.

A bystander who attempted to intervene was shot and wounded while rescuing a third person.

The two victims were a couple, according to The Guardian. The report said they were studying Urdu and teaching Mandarin in Quetta.

Pakistani security officials inspected the area where the Chinese couple were abducted

A handout photo appearing to show the two Chinese nationals have been distributed by the European Pressphoto Agency. The photo was made available by the Pakistani Police, said the agency.

The photo show the portraits of two Chinese nationals, identified as Li Xinheng and Lu Ling Lina.

A statement from the ISIS news agency on late Thursday said the two Chinese teachers had been killed.

The ISIS claim came hours after Pakistan's military released the pictures of what it said were 12 slain members of the militant group.

They were killed in this week's operation in the south-western province of Baluchistan, where the military said it foiled an attempt to set up an organised IS militant base.

Thousands of Chinese work in Pakistan and have sometimes been targeted by militants. China is a longtime ally of Pakistan and is building roads and power plants under multi-billion-dollar project termed the China-Pakistan Economic Corridor.

Islamic militants opposed to Chinese rule in the north-western region of Xinjiang are also believed to be sheltering in Pakistan's lawless tribal areas, from which they have threatened to launch attacks.