As the clock ticked down to the Nov. 1 deadline Pakistan set for undocumented migrants to leave the country, Muhammad Rahim boarded a bus from Karachi to the Afghan border.

"We'd live here our whole life if they didn't send us back," said the 35-year-old Afghan national, who was born in Pakistan, married a Pakistani woman and raised his Pakistan-born children in the port city - but has no Pakistani identity documents.

And recent daily returnee figures are three times higher than normal, Taliban refugee ministry spokesman Abdul Mutaleb Haqqani told Reuters on Oct 26.

Near Karachi's Sohrab Goth area - home to one of Pakistan's largest Afghan settlements - a bus service operator named Azizullah said he had laid on extra services to cope with the exodus. Nearby, lines formed before competitor bus services headed to Afghanistan.