The majority of the refugees crossed in July and August, Qaisar Khan Afridi, spokesman UNHCR at the Voluntary Repatriation Centre outside the northwestern city of Peshawar, near the Afghan border, told AFP.
In the six months prior to that just 7,000 refugees crossed back into Afghanistan, according to UNHCR figures.
Pakistani officials said the increase came after they vowed to tighten border controls, particularly at the porous Torkham Gate crossing.
Pakistan is home to 1.5 million registered and about as many undocumented Afghan refugees, with growing insecurity in Afghanistan impeding voluntary return programmes.
But UNHCR said refugees are increasingly anxious about their future in Pakistan.
In June, Islamabad granted Afghan refugees an extra six months to remain in Pakistan as authorities stepped up efforts to work with the UN and Kabul to relocate camps to Afghanistan. Fears are growing that the December deadline will be final.
Other factors include the UNHCR decision to double its cash grant for voluntary returnees from USD 200 to USD 400 per individual in June, and a campaign by the Afghan government to lure its citizens back with the slogan "My country, my beautiful country".
An AFP team in Peshawar saw thousands of men, women and children waiting their turn for verification at UNHCR's Voluntary Repatriation Centre in the suburbs of Peshawar this week.
The vast majority of those returning had been living in Pakistan's northwestern Khyber Pakhtunkhwa province, of which Peshawar is the capital.
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