Taliban militants in northwest Pakistan kidnapped up to 400 students from a military-run college, with teachers and relatives, on Monday as they were travelling in mini-buses, police said.
The abduction took place while the Pakistani army pressed on with an offensive against the Taliban in the Swat valley in another part of the northwest.
Taliban fighters with hand grenades seized the students' convoy heading home for the summer holiday from the North Waziristan ethnic Pashtun region on the Afghan border to the town of Bannu, 240 km (150 miles) southwest of Islamabad.
"The driver of one of the vehicles managed to escape and students reported to us that their colleagues have been kidnapped by Taliban," said Razaq Khan, a police official in Bakka Kheil village in North West Frontier Province.
"The students reported that one Taliban carrying a hand grenade boarded each of the buses and took them away. We don't know where they have gone," he said.
Bannu police chief Iqbal Marwat said up to 400 people in 28 vehicles were seized. Sixty-seven escaped, he said.
Militant violence has grown in nuclear-armed Pakistan since mid-2007, with attacks on security forces, and on government and Western targets.
The violence has alarmed the United States, which needs Pakistani action to help defeat al Qaeda and get to grips with the Taliban insurgency in neighbouring Afghanistan.
There are several Taliban- and al-Qaeda-linked groups based in North Waziristan in a loose alliance with Taliban in Swat. The army has not launched an offensive in North Waziristan.
Militants have captured many members of the Pakistani security forces in the past few years but the kidnapping of civilians is relatively rare.
Mirza Mohammad Jihadi, an adviser to the prime minister on the tribal areas, said efforts were in progress to secure their release.
"Contacts have been established with the kidnappers and talks are under way," Jihadi told Reuters.
Government officials said they were checking the report.
NOTHING TO EAT
Pakistan launched an offensive against a growing Taliban insurgency in the Swat valley, 120 km (80 miles) northwest of northwest of Islamabad, a month ago.
The army captured Swat's main town, Mingora, on Saturday, and the next day lifted a curfew, allowing thousands of people trapped by the fighting to leave.
"There is nothing to eat, no water, no electricity, no gas, no telephone, no hospital," said Nisar Khan, a Mingora resident, who brought his family out on Sunday.
Fighting was continuing elsewhere in a valley once famed for its alpine beauty and the military said on Monday 18 militants and two soldiers had been killed in the previous 24 hours.
The army sent in 15,000 troops, backed by artillery and air power against a militant force initially estimated at about 5,000, but later put at 2,000 hardcore fighters.
There were no independent estimates of casualties but the army said more than 1,230 militants had been killed, while it had lost more than 90 men since the fighting began.
Most of Mingora's 300,000 residents fled after the army told them to get out before launching its attack. About 50,000 stayed behind, suffering the privations of a city under siege.
Officials say an estimated 2.4 million people have been displaced by the conflict in Swat and adjoining areas, prompting U.N. warnings of a humanitarian crisis.
Up to 90 percent, have been given shelter by friends or relatives and the remainder have crowded into camps.
Aid workers say many civilians have been wounded in the fighting or have perished trying to reach safety.
"A lot of people have been wounded in the fighting but there are no medical services in many areas," said Fazil Tezara, head of the Belgian branch of Medecins Sans Frontieres in Pakistan.
"Wounded people are trying to get to the nearest hospital in Timergara, but that is a seven-day trek through mountains and people are dying on the way and their bodies are just lying there," Tezara said, referring to the main town in Lower Dir, a district to Swat's west.
The militants have responded to the offensive with eight bomb attacks in various towns and cities since late April and have threatened more. Main cities are on alert.