WASHINGTON: Afghanistan's Taliban have promised US forces to reduce attacks and casualties after a major assault on a city raised questions about ongoing peace talks, a US envoy said Thursday.

"At present too many Afghans are dying. With the re-set, we expect that number to drop significantly," Zalmay Khalilzad, who negotiated a February 29 deal with the Taliban to pull out US forces, wrote on Twitter.

Khalilzad said that he and General Austin Miller, the commander of US forces in Afghanistan, met several times with the Taliban to discuss "strictly adhering" to the terms of the agreement.

"This means reduced numbers of operations," Khalilzad said.

"Attacks have been on the rise in recent weeks - threatening the peace process and alarming the Afghan people and their regional and international supporters."

The Taliban confirmed that their chief negotiator Abdul Hakim met with Khalilzad and Miller over the past few days.

Both sides stressed the importance of the US-Taliban agreement and discussed ways to ensure its "full implementation," the group's Doha spokesman Mohammad Naseem Wardak tweeted.

Under the February deal, the Taliban said they would not attack cities while the US said it would refrain from assaults on the insurgents except to defend the Afghan forces. Afghan officials accused the Taliban of breaching the agreement with an assault on the city of Lashkar Gar, from which tens of thousands of people have fled in recent days.

Under the February deal, the Taliban agreed not to allow Afghanistan to be used by foreign extremists - the original reason for the US invasion after the September 11, 2001 attacks - and halted operations against Western forces.

The Taliban did not promise to end violence against the internationally recognized government in Kabul but said they would discuss a "permanent and comprehensive ceasefire" in peace talks.