Amnesty International and Human Rights Watch issued a joint statement ahead of a major donors' meeting on Afghanistan on December 3-4 here.
Despite the government's important improvements in human rights, many serious abuses continue and pose a threat to the fragile gains of the past decade, the statement said.
Delegations from more than 70 countries will gather for the London Conference on Afghanistan, a follow-up to the July 2012 Tokyo Conference on Afghanistan.
The London Conference will be the first such meeting under Afghanistan's new president, Ashraf Ghani, and coincides with declining donor engagement in tandem with the end-2014 deadline for the withdrawal of the majority of foreign combat forces from Afghanistan.
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"Afghanistan needs sustained political and financial backing to strengthen human rights and rule of law," said Richard Bennett, Asia-Pacific Director, Amnesty International.
"Donors and the new unity government must ensure that human rights are at the heart of reforms undertaken by the new Afghan unity government and donor assistance to Afghanistan," he said.
"Without international pressure and aid specifically targeted at ending rights abuses, many of the gains of the last 13 years could easily slip away," he said.