The dispute over Gabon's presidential election has intensified as opposition candidate Jean Ping is mounting a legal challenge and demanding a recount.

A lawyer for Ping, Jean Remy Bantsantsa, announced the move Thursday night.

Ping has already publicly declared himself the winner, even though election results said incumbent President Ali Bongo Ondimba won the Aug. 27 vote.

Those results showed Bongo won by less than 2 percentage points. There is no provision for a runoff in this Central African nation.

European Union observers have expressed concern about results in Bongo's stronghold province.

Bongo's campaign has said it also planned to contest results at some of the polling stations.

Bongo came to power in 2009 after the death of his father, who had ruled Gabon for more than four decades.