Equatorial Guinea's President Teodoro Obiang Nguema Mbasogo

French investigators have seized a Paris townhouse belonging to the son of Equatorial Guinea's president as part of a money-laundering probe, a judicial source said on Friday.

Millions of euros worth of art, antiques and other valuables were seized in February from the same six-floor building which is owned by Teodoro Obiang, agriculture minister and son of the small oil-rich African state's president, reports Reuters.

Two French judges issued arrest warrants last month for Obiang on money laundering charges, saying they suspected he had siphoned off state funds to buy property in France.

Obiang denies any wrongdoing.

In late 2011, luxury cars, including Bugattis and Ferraris, were also confiscated from the same property, which is situated in one of the French capital's smartest neighbourhoods.

The French warrant means Obiang is barred from entering France and may also face travel restrictions in his own country.

He faces similar money-laundering charges in the United States, where he owns property estimated to be worth several tens of millions of dollars.

Obiang, whose full name is Teodoro Nguema Obiang Mangue, is frequently seen enjoying an extravagant lifestyle abroad, complete with multi-million dollar mansions, jets and yachts.

His father, President Teodoro Obiang, has ruled the former Spanish colony for more than three decades and has been widely condemned by rights groups as one of the world's most corrupt leaders.