The Army Chief General Raheel Sharif on April 2 had endorsed the death sentence to six militants and life term to one but the Supreme Court Bar Association (SCBA) yesterday filed a petition seeking to halt the implementation of sentences.
The life sentence of the convict has also been stayed by the apex court.
"The execution of military courts' death sentences, those which have already been awarded and those which will be awarded, is suspended," Chief Justice Nasir ul Mulk said.
Pakistan set up special military courts for speedy trial of militants but SCBA challenged the laws establishing the military courts, saying it violated constitution of the country.
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In the petition challenging the executions, the human rights activist Asma Jehangir requested the Supreme Court to stay death sentences until the court decided the fate the 21st constitutional amendment which set up military courts.
Nine military courts were established in January, after militants attacked a school in Peshawar, killing 150 people, mostly children.
The new courts expanded the military's powers, giving it the authority to try civilians accused of terrorism.