Pakistan's army has temporarily lifted the curfew in large parts of the Swat valley, to allow civilians to flee the intense fighting against the Taleban, BBC reported.
The curfew is being suspended for eight hours during the day, officials say.
Prime Minister Yousuf Raza Gilani has said the army would be successful in clearing the area of the militants, who have largely been controlling it.
The UN says more than 800,000 people are living in harsh conditions in camps for those displaced by the fighting.
Thousands arrived after the curfew was eased at the weekend.
A further influx is expected on Friday as it is lifted in parts of the Swat valley from 0600 to 1400 (0100-0900GMT).
About 150,000 civilians are trapped in the main city, Mingora, with gas, electricity and food increasingly scarce, the BBC's Barbara Plett in Islamabad says.
Residents told the AFP news agency that Taleban holding the city had mined roads and dug trenches around it.
Up to 15,000 troops have now been deployed in the Swat valley and neighbouring areas to take on up to 5,000 militants.
Military operations including artillery shelling of suspected militant hideouts in Swat and the neighbouring district of Lower Dir killed about 124 militants and left nine soldiers dead in the 24 hours before the curfew was relaxed, the army said.
Pakistan's army chief Gen Ashfaq Kayani visited troops on the frontlines - reportedly for the first time since the bombardment began.
A new front was opened earlier this week by troops airlifted by army helicopters to Peochar, which is about 65km (40 miles) north-west of Mingora.
On Friday Gen Kayani will lead a closed-doors briefing for MPs on the ongoing operation in the Malakand region.
UN High Commissioner for Refugees Antonio Guterres has warned that the plight of displaced people could spark further conflict.
"If you are not able to cope with the challenges posed by overwhelming displaced... this population will become a huge factor of de-stabilisation," Mr Guterres said after visiting a camp for people displaced by the fighting.
The UN has called for a massive and urgent injection of emergency humanitarian aid.
The Pakistani government began its offensive in the Swat valley in late April.
In February, it had signed a peace agreement with the Taleban there, allowing Sharia law to be enforced, in a move sharply criticised by Washington.
But the militants then expanded into neighbouring districts, prompting the government to abandon the peace deal.
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