Pakistan lodged a strong protest and expressed serious concern to the Afghan government on the brutal murder of the Frontier Corps personnel inside Afghanistan.
"This protest was conveyed by Sartaj Aziz, Adviser to the Prime Minister on National Security and Foreign Affairs, to Afghan Foreign Minister Zarar Ahmad Osmani today in Male, Maldives where both were attending the SAARC ministerial meeting," said a statement from Pakistan's Foreign Office.
He urged the Afghan government to take prompt action to apprehend and punish the perpetrators of the "heinous and inhumane crime", the statement said.
Osmani promised to convey Pakistan's message of concern to authorities in Afghanistan and revert shortly, it said.
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A faction of the Tehrik-e-Taliban Pakistan in Mohmand tribal region claimed on Sunday it had killed the 23 security personnel who were abducted in 2010.
Media reports earlier said Omar Khalid Khurasani, head of the faction in Mohmand Agency that is known as the most rigid and extremist, was in Afghanistan and all the kidnapped troops were killed in the neighbouring country.
The News daily had quoted its sources as saying that the troops were killed in stages, most of them last month, in Afghanistan.