The bodies of 22 suspected militants have been found in Pakistan's Swat valley in the past day, officials say, BBC reported.
Corpses allegedly began appearing several weeks ago. Officials said 18 were found in the region last week.
Local residents say the Pakistani security forces have been carrying out extra-judicial killings as part of their offensive against the Taliban.
The army and police have denied the accusations, saying locals could be behind the killings for "revenge".
A Pakistani human rights watchdog says reports of extra-judicial killings are credible.
"We call for a proper investigation to find out who killed them, who were the dead, whether they were militants, innocent people or bystander," said I A Rehman of the independent Human Rights Commission of Pakistan told the Reuters news agency.
"We've already demanded an investigation but nothing has happened. It's a serious matter and must be looked into," he said.
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