By Michelle Nichols
UNITED NATIONS (Reuters) - The United States is trying to rally enough votes at the United Nations Security Council to impose an arms embargo on South Sudan following continued fighting and human rights abuses, diplomats said on Thursday.
A resolution needs nine votes in favour and no vetoes by Russia, China, Britain, France or the United States. The council could vote as early as Friday.
Diplomats said Washington has secured at least seven votes, but some council members say the timing is not right given attempts to revitalise the peace process.
The U.S. mission to the United Nations was not immediately available to comment.
South Sudan, which split off from its northern neighbour Sudan in 2011, has been gripped by a civil war since 2013 caused by political rivalry between President Salva Kiir and his former deputy Riek Machar.
Last Friday the government and opposition signed an agreement on security arrangements which follow on from a ceasefire deal last month.
However, on Thursday South Sudan's parliament voted to extend Kiir's mandate until 2021 in a move likely to undermine the peace talks as opposition groups have said the change would be illegal.
At the end of May, the Security Council renewed its targeted sanctions regime on South Sudan until July 15 and said it would consider an arms embargo and blacklisting six senior South Sudan officials if U.N. chief Antonio Guterres reported by June 30 that there was still conflict or a lack of a viable political agreement.
That resolution was adopted with nine votes in favour and six abstentions.
"There have been credible reports of fighting," Guterres told the Security Council in a June 29 letter. He also said U.N. peacekeepers had documented gross violations of international human rights and humanitarian law.
"While the outcome of regional and international efforts to deliver a political settlement of the conflict is yet unclear, I must reiterate that any revitalised agreement must be inclusive, fair and sustainable," Guterres wrote.
The U.N. human rights office said on Tuesday that at least 232 civilians were killed and 120 women and girls raped in "scorched earth" attacks by South Sudan government troops and aligned forces in opposition-held villages earlier this year.
(Reporting by Michelle Nichols; editing by Grant McCool)