These are some key facts about Islamabad's plan to deport hundreds of thousands back to its western neighbour Afghanistan:

- Pakistan announced the Wednesday deadline on Oct. 3, giving more than a million people about four weeks to move.

- The sudden expulsion threat came after suicide bombings this year that the government said involved Afghans, though without providing evidence. Islamabad has also blamed them for smuggling and other militant attacks as well as petty crimes.

- Islamabad says Afghan nationals were found to be involved in attacks against government and the army, including 14 of this year's 24 suicide bombings.

- Pakistan is home to more than 4 million Afghan migrants and refugees, about 1.7 million of them undocumented, according to Islamabad, although many have lived in Pakistan for their entire lives.

- About 600,000 Afghans have crossed into Pakistan since the Taliban took over in 2021, joining a large number present since the Soviet invasion of Afghanistan in 1979 and the ensuing civil wars.