ISLAMABAD (AP) — Pakistan's Prime Minister on Tuesday approved a long-awaited “comprehensive military operation” against separatist groups in the restive southwest, more than a week after an outlawed group killed 26 people in a suicide bombing at a train station, officials said.

The announcement by Shehbaz Sharif to launch the operation "against terrorist organizations" operating in Balochistan came after a meeting of the government's security committee in Islamabad, the capital. On Nov. 9, a suicide bomber with the outlawed Baloch Liberation Army group blew himself up at a train station in Quetta, killing 26 people, most of them soldiers.

In a statement, Sharif's office said the BLA and other groups will be targeted buit didn't say when the operation would begin. The office blamed the groups for “targeting innocent civilians and foreign nationals to scuttle Pakistan’s economic progress by creating insecurity at the behest of hostile external powers."

In recent months, Balochistan and northwestern Khyber Pakhtunkhwa province have witnessed a surge in militant violence, most blamed on the outlawed BLA and TTP groups. The train station attack in Quetta was the deadliest since August, when separatists killed more than 50 people in multiple coordinated attacks on passengers buses, police and security forces across Balochistan.

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

The BLA mostly targets security forces and foreigners, especially Chinese nationals who are in Pakistan as part of Beijing’s multibillion-dollar Belt and Road Initiative. The BLA wants a halt to all Chinese-funded projects and for Chinese workers to leave Pakistan to avoid further attacks.

Also Tuesday, a suicide car bomber targeted a security post in Bannu, a district in Khyber Pakhtunkhwa, according to Irfan Kahn, a local police official. Kahn said gunshots were heard and and ambulances had arrived at the scene of the attack. He provided no further details, and it was not immediately clear how many people were killed or wounded in the attack.

The attack came a day after Pakistani security forces raided a militant hideout in the northwestern district of Tirah, sparking a shootout in which at least 10 insurgents were killed and several others were wounded.

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Associated Press writer Riaz Khan contributed to this story from Peshawar, Pakistan.