Authorities say increasing numbers of women and children are fleeing Khyber, one of the seven districts that make up Pakistan's semi-autonomous tribal belt.
More than 500 families are arriving on a daily basis at Jalozai camp, near the northwestern city of Peshawar, camp administrator Noor Akbar told AFP.
"We have registered 56,842 families or 264,253 individuals so far since the offensive was launched in January," Akbar said.
"We expect more will flee as the fighting continues."
Save the Children said it estimated that 63,000 families, or nearly half a million people, have already been displaced from Khyber.
A spokesman said the charity's estimate was much higher than the number registered because most people chose to live outside the camp and because new arrivals were mostly women and children put off by long registration queues.
"Save the Children estimates that over 600,000 in total will be displaced if military operations continue -- among which over 300,000 are expected to be children," the charity said in a report.
Last month, the UN refugee agency said more than 181,000 people had fled the fighting and that 85% of those registered chose not live in Jalozai.
The fighting started on January 20 when government troops attacked militant groups in Khyber.
Officials say the fighting is concentrated in a large area, home to scores of settlements, between Tirah valley and Bara town.
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If these half a million people had shown moral courage, terrorists would have been running for shelter rather than these half a million people.
this credit goes to general zia who made talibans and instead of educating pukhtoons they handed over arms on the name of Islam .. such policy was continued till 2001 in afghanistan and pukhtoons . so this time please do not give them arms please educate them
So army should stop fighting TTP terrorists???