FILE - Jean Ping speaks to reporters in London, Feb. 23, 2012.
FILE - Jean Ping speaks to reporters in London, Feb. 23, 2012.

LIBREVILLE - Gabon's leading opposition figure was charged Thursday with imprisoning and torturing people who had attacked his home, risking up to 10 years in prison and possible elimination from a presidential election expected in 2016.

Jean Ping, 72, a former head of the African Union, was charged with the illegal imprisonment, inhuman treatment and torture of some of the people who threw rocks at his residence Monday, state prosecutor Sidonie Ouwe said.

Ping, the head of an opposition coalition, said Monday that his house had been attacked by at least 200 people, one armed with a poisoned knife, sent by an adviser to President Ali Bongo. The government denied the accusation.

"Nothing justifies the barbarism ... of this statesman who ordered the arrest of the young men and took them to his compound," Owue told reporters. "Degrading and humiliating treatment was then inflicted on them, including physical torture."

Ping, who had not been taken into custody, was not immediately available to comment on the charges.

An erstwhile ally of former President Omar Bongo, the current president's father, Ping has helped lead protests in recent weeks over a range of grievances and trade union disputes, including one in December in which a demonstrator was killed.

The protests caused a temporary reduction in Gabon's 230,000-barrel-per-day output of crude oil. The country is one of sub-Saharan Africa's top oil producers, but about a third of the population of 1.5 million people lives in poverty.

Ali Bongo won a disputed election in the former French colony in 2009 following the death of his long-ruling father.