Hundreds of Taliban crossed into Pakistan from the Afghan province of Kunar on Thursday and attacked two villages, killing at least five people and abducting 25 more, security officials said, DPA reported.
The pre-dawn attack took place in the Sargai and Manro Zangal areas of Bajaur, one of the seven tribal districts where Pakistani forces are fighting Islamist insurgents.
"Hundreds of militants crossed the border at around 4 am local time (2300 GMT) in small groups and attacked the security posts and the villages," said Wajid Ali, a spokesman for the paramilitary Frontier Corps.
"They carried out indiscriminate firing on the civilians and security forces. They did not spare even women and children. During the attack they also damaged mosques," Ali said. The death toll had yet to be confirmed since the fighting was going on, he said.
However, a local intelligence official said that the militants had so far killed five people, including two women, while eight were injured. "They have kidnapped 25 people. Among them are some security personnel."
On June 1, hundreds of fighters entered the Pakistani frontier district of Upper Dir from Kunar and attacked a border post and three villages. Two days of fighting left 27 security personnel and eight civilians dead.
A spokesman for Pakistani Taliban commander Maulana Fazlullah accepted responsibility for the June 1 raid.
Fazlullah fled to Kunar after Pakistani forces launched a major operation in the north-western region of Malakand of which Upper Dir is a district. He is believed to have joined by hundreds of fleeing militants from Malakand and Bajaur.
Pakistan has protested to NATO and Afghan officials over their failure to check Taliban infiltration into Pakistan.