Pakistani jets and ground forces have killed 67 people in a north-western tribal region near the Afghan border, days after Taliban fighters killed 148 people - most of them children - in a school massacre.

Meanwhile, a Pakistani prosecutor said the government will try to cancel the bail granted to the main suspect in the 2008 Mumbai terror attacks - a decision that outraged neighbouring India and called into question Pakistan's commitment to fighting militancy.

The violence at a school in Pakistan's north-west earlier this week stunned the country and prompted calls for retribution.

In the wake of the mass killing, the military has struck targets in the Khyber tribal region and approved the death penalty for six convicted terrorists.

The military said its ground forces had killed 10 militants while jets killed another 17, including an Uzbek commander.

Another 32 alleged terrorists were killed by security forces in an ambush in Tirah valley in Khyber as they headed toward the Afghan border, the military said.

The Khyber zone is one of two main areas in the north-west where the military has been trying to root out militants in recent months.

Khyber borders Peshawar, where the school massacre took place, and militants have traditionally attacked the city before fleeing into the tribal region where police cannot chase them.

The other area is North Waziristan, where the military launched a massive operation in June.

In the southern province of Baluchistan, Pakistani security forces killed a senior Pakistani Taliban leader along with seven of his associates in three separate pre-dawn raids, said a tribal police officer, Ali Ahmed.

Army chief Gen Raheel Sharif has signed the death warrants of six "hard core terrorists" convicted and sentenced to death by military courts, the army said.

It is unclear when the military plans to hang the six men, but authorities generally move quickly once death warrants are signed.

Such executions are usually carried out at prisons under the supervision of army officers before the bodies are handed over to relatives for burial.

There was no information on the men or the crimes for which they were convicted.

The news comes after prime minister Nawaz Sharif announced that he would lift a moratorium on executions in terrorism-related cases. The government has not yet carried out any executions.

The lifting of the moratorium was aimed at demonstrating the government's resolve, but the decision by an anti-terrorism court to grant bail to the main suspect in the Mumbai attack, Zaki-ur-Rahman Lakhvi, called into question that commitment.

Lakhvi is one of seven people on trial in Pakistan for the assault, but the trial has produced no results so far. It has been closed to the media.

India reacted with outrage to news of Lakhvi's pending release.

Special public prosecutor Abu Zar Peerzada said he would appeal to the High Court to cancel the bail and said Lakhvi had not yet been released.