Torkham and Chaman crossings on the Pak-Afghan border opened for the second day on Wednesday as thousands of stranded Afghans and Pakistanis crossed into their respective countries.
The Pakistan government had decided to close the border last month amid a string of deadly militant attacks which the military leadership claimed were carried out by militants operating from safe-havens in Afghanistan.
The border was temporarily reopened for two-days on Tuesday in a bid to to ease tensions between the two neighbours and relieve some of the backlog of people and vehicles at the crossings.
Over 12,500 Afghan nationals crossed the border to return home on Tuesday, Radio Pakistan reported.
According to the state-run daily, 450 Pakistanis have returned to their country via Torkham border check-post since the border opened on Tuesday.