United Nations peacekeepers in Liberia say they will react strongly after threatening text messages were sent to the chief of the elections body.
Frances Johnson-Morris has laughed off the threats
National Elections Commission chief Frances Johnson-Morris told the BBC she was not worried by two recent messages sent to her mobile phone.
"I am very relaxed; I just laughed when I got them," she said
One accused her of being a sister of one of the leading candidates - which she denies.
The UN mission (Unmil) said in a statement that they took seriously the threats which "constitute a serious impediment to the consolidation of peace and stability in Liberia".
FIRST ROUND RESULTS
George Weah: 28.3%
Ellen Johnson-Sirleaf: 19.8%
Charles Brumskine: 13.9%
3,066 polling stations declared
"The 11 October elections, which were held in a violence-free environment, have universally been acknowledged as free, fair and transparent. Their results reflect the will of the Liberian people," the statement continued.
"Unmil will react robustly to any threats of violence against individuals involved in the elections process."
The second round of presidential elections takes place on 8 November.
Former soccer star George Weah faces his nearest rival Ellen Johnson-Sirleaf to decide who becomes Liberia's first elected head since the 14-year civil war ended in 2003.