KABUL (AFP) - Afghan authorities plan to release 900 more Taleban prisoners on Tuesday (May 26), as calls grew to for the militants to extend a ceasefire on its third and final day.

The pause in fighting - which came into effect on Sunday to mark the Muslim holiday of Eid al-Fitr - was, for the most part, holding across the country, officials said.

The government responded to the Taleban's three-day ceasefire offer on Sunday by announcing plans to release up to 2,000 insurgent prisoners.

On Monday, they freed 100, and will release another 900, the government said - the biggest group of Taleban prisoners to be freed so far.

The exact number could vary subject to legal procedures, National Security Council spokesman Javid Faisal told AFP.

The National Security Council, in a statement on Twitter, said the release of prisoners was to "advance the cause of peace, including the continuation of the bilateral ceasefire and the immediate start of direct negotiations".

The ceasefire, only the second of its kind in the 19-year-old conflict, has raised hopes of an extended truce that could pave the way for long-awaited peace talks between the Taleban and Afghan government.

"Extend the ceasefire. Save lives," Mr Shaharzad Akbar, head of Afghan Human Rights Commission, said on Twitter.

"End the violence so that we can all focus on making services available to the most vulnerable across the country, on expanding access to human rights, so that we have space to breathe."

A Taleban source indicated the group could extend the ceasefire by seven days if the government speeds up the release of prisoners.

Another insurgent source said militants plan to release about 200 Afghan security force members they hold.

The Taleban have insisted that they want some 5,000 members held by the government released as agreed in a deal with the United States.

The US-Taleban deal signed in February paves the way for all foreign forces to leave the country by next year.

It also stipulates that the Afghan government would release up to 5,000 Taleban prisoners and the militants would free about 1,000 national security personnel.

Prior to this week's releases, Kabul had already freed about 1,000 Taleban inmates, while the insurgents had let go about 300 Afghan security forces captives.

US Secretary of State Mike Pompeo, while welcoming the latest developments, insisted that Taleban prisoners should not return to the battlefield once freed.

President Ashraf Ghani has said his administration is ready to begin the peace negotiations, seen as key to ending the war in the impoverished country.