Suspected militants on Sunday killed two men accused of spying for the US in Pakistan's tribal region of North Waziristan, officials and tribesmen said.
Bodies of Afghan nationals Zar Muhammad and Nek Muhammad were found in the Spin Wam area near a canal, according to the private NNI news agency.
A note in Pashto language, found near the bodies, said they were spying for the US on local Taliban.
The note warned that anyone spying for the US or Afghanistan would face the same fate, the news agency said.
The report cited locals as saying the slain Afghans belonged to the Khost province, which borders Pakistan's North Waziristan.
They said five masked men brought them from other areas and shot them dead in the Pakistani area Sunday.
Local Taliban say that espionage has led to US missile strikes on the suspected hideouts of the militants.
US drones regularly fire missiles on hideouts of suspected militants in Waziristan tribal regions.
Taliban in Pakistan recently released a video of five people, who said they were spying on Al Qaeda people on the "instructions of the army". But the army spokesman has denied the claim and said Pakistan was not helping the US in the missile strike and considers such attacks counter-productive.
Pakistan says the US has carried out around 35 missile attacks in the tribal regions since August.