The three-day demonstration coincides with the 22nd anniversary of the 1991 Paris Peace Accords on Cambodia, which laid the groundwork for U.N.-sponsored elections after the brutal rule of the Khmer Rouge and years of civil war that followed. The countries that received opposition petitions were all signatories to the 1991 Accords.
The government denies election fraud, and has rejected opposition demands for an independent investigation. It maintains that its inauguration of a new parliament in September was legitimate and has filled parliamentary commissions with ruling party members.
Ou Virak, president of the Cambodian Center for Human Rights, said that intervention from abroad was "not going to happen." Moreover, he said, seeking outside help was counterproductive to building democracy from within Cambodia.
"By going abroad, you're actually re-confirming this attitude of we need to depend on the U.N. jumping out of the sky, out of a plane or whatever, to rescue us," he said.
The Australian embassy said in a statement Friday that it had received the petition and that its ambassador, Alison Burrows, "urged both parties to continue their dialogue including on electoral reform."