KARACHI: A Pakistani separatist group claimed responsibility for a late night bombing that targeted a convoy with Chinese nationals outside the country’s largest airport, killing two workers from China and wounding eight people, officials and the insurgent group said Monday.

The attack by the Baloch Liberation Army outside the airport in the southern port city of Karachi was the latest deadly assault on Chinese here and came a week before Pakistan is to host a summit of the Shanghai Cooperation Organisation, a security grouping founded by China and Russia to counter Western alliances.

The explosion, which the BLA said was the work of a suicide bomber, also raised questions about the ability of Pakistani forces to secure high-profile events or foreigners in the country.

Among the wounded were also police officers who were escorting the Chinese convoy when the attack happened.

Initially, Pakistani authorities gave conflicting details and said the explosion may have been from an oil tanker but police later confirmed it was a bomb attack.

Pakistani news channels broadcast videos of flames engulfing cars and a thick column of smoke rising from the scene.

Troops and police cordoned off the area.

On Monday, counter-terrorism officials were investigating how the attacker reached Karachi, Pakistan’s largest city.

The spokesman for the separatist group, Junaid Baloch, said Monday that one of their suicide bombers targeted the convoy of Chinese engineers and investors as they left the airport.

The Baloch Liberation Army is mainly based in the restive southwestern Balochistan province but it has also attacked foreigners and security forces in other parts of Pakistan in recent years.

Pakistani security officials say a police bomb disposal unit in Sindh province, where Karachi is the capital, had cleared the road outside the airport ahead of the movement of the Chinese convoy, which was being escorted by police and security officials in several vehicles.

However, the road had not been blocked to avoid inconvenience for residents and travellers going to or from the airport, the officials said, speaking to The Associated Press on condition of anonymity to discuss security details.

Pakistan’s Ministry of Foreign Affairs denounced the bombing, saying it was a “heinous terrorist attack near Karachi airport.”

It said another Chinese was injured in the attack.

“We extend our deepest condolences and sympathies to the families of the victims, both Chinese and Pakistani, and offer prayers for the swift recovery of the injured,” said the ministry in a statement.

“We remain resolute in bringing to justice those responsible for this cowardly attack.”

Pakistan’s Prime Minister Shehbaz Sharif said he was shocked and saddened, describing the attackers as “enemies of Pakistan” and promising the perpetrators would be punished.

“I strongly condemn this heinous act and offer my heartfelt condolences to the Chinese leadership and the people of China, particularly the families of the victims,” he wrote on the social media platform X.

“Pakistan stands committed to safeguarding our Chinese friends,” he added.

“We will leave no stone unturned to ensure their security & well-being.”

Authorities estimate that the BLA, which Pakistan and the United States have designated a terrorist organisation, has around 3,000 fighters.

It regularly targets Pakistani security forces but has also in the past attacked Chinese nationals.

According to Abdullah Khan, a senior defence analyst and managing director of the Islamabad-based Pakistan Institute for Conflict and Security Studies, BLA has preferred attacks on “moving targets” but its ability to launch high-profile attacks has increased in recent years.

More BLA attacks around the Shanghai Cooperation Organisation summit next week cannot be ruled out, Khan told The Associated Press.

Port Qasim Electric Power Company is owned by PowerChina Resource Ltd, a subsidiary of Power Construction Corporation of China whose spokesperson, Geng Xingqiang, said the company “is in the middle of making arrangements to actively deal with the incident.”

Pakistan hosts thousands of Chinese workers as part of Beijing’s multibillion-dollar Belt and Road Initiative, which is building major infrastructure projects.

The outlawed BLA has long waged an insurgency seeking independence and has repeatedly warned against any Chinese working in Balochistan.

The Sunday night attack followed deadly attacks in August that killed more than 50 people in Balochistan.

Sharif at the time said the attackers sought to harm Chinese-funded development projects.

The oil- and mineral-rich Balochistan is Pakistan’s largest but also least populated province. It is also a hub for the country’s ethnic Baloch minority whose members say they face discrimination and exploitation by the central government.

Along with separatist groups, Islamic militants also operate in the province.

In 2018, the BLA stormed the Chinese Consulate in Karachi, triggering an intense hourlong shootout that killed two Pakistani civilians and two police officers. All three assailants were also killed.

In March, in northwestern Pakistan, a suicide bombing killed five Chinese engineers and their Pakistani driver as they headed to the Dasu Dam, the country’s biggest hydropower project.

In April, five Japanese workers were unharmed when a suicide bomber targeted their van as they were on their wat to a factory in Karachi. One bystander was killed.

In July 2021, at least nine Chinese nationals working on a dam and four Pakistanis were killed when a suicide bomber targeted their bus in northwestern Pakistan.

Local authorities first said it was a road accident but Beijing insisted it was a bombing, which Islamabad later confirmed.

In 2022, three Chinese teachers and their Pakistani driver were killed when an explosion ripped through their van at the University of Karachi campus.