Venezuela opposition leader Henrique Capriles announced Tuesday he would go "before international bodies" to contest the April presidential vote that brought Nicolas Maduro to power.
The opposition candidate said he had "exhausted" domestic remedies after waiting three months for a supreme court decision on his appeal.
"We will go before international bodies (...) We plan to file our complaint at the end of the month," Capriles added.
Official results gave Maduro, 50, the hand-picked successor of long-time leader Hugo Chavez, a razor-thin margin of just 1.5 percent over Capriles, 41, in the April 14.
Capriles did not specify to which international bodies he planned to appeal, but said two complaints would be filed, one in his name and one in the name the Democratic Unity Roundtable (MUD), an umbrella coalition for opposition parties.
Despite his questioning of the electoral system, Capriles has said that MUD will nonetheless participate in December 8 municipal elections, so as to not hand the Venezuelan government "a gift."