Authorities have decided to take action against terrorists in Bajaur and Khyber districts of Khyber Pakhtunkhwa, government sources said on Tuesday.
They said the decision was taken after talks between militants and the Bajaur Amn Jirga failed.
Under the talks, tribal elders had put up three demands, including the expulsion of militants from the tribal area.
The official sources said there are about 300 terrorists present in two areas of Tehsil Mamund of Bajaur and more than 350 in Khyber district.
The population of the Tehsil Mamund is more than 300,000, sources said adding that more than 40,000 people have moved to other areas from Bajaur.
As per official sources, more than 80% of the terrorists in Khyber and Bajaur are Afghans.
This is a developing story and is being updated with further details.