French anti-terror prosecutors have opened a preliminary inquiry into torture and acts of barbarism allegedly committed by Emirati General Ahmed Nasser Al-Raisi who in November became president of Interpol, judicial sources said on Thursday.

The probe follows a legal complaint by an NGO which accused Raisi of being responsible for the torture of an opposition figure in his role as high-ranking official at the United Arab Emirates interior ministry.

The Gulf Centre for Human rights (GCHR), holding Raisi responsible for inhumane treatment of Ahmed Mansoor, an opponent of the Emirati government, lodged its complaint in January with the anti-terror prosecutors unit whose brief includes handling crimes against humanity.

Allegations of torture had already been levelled at Raisi by human rights organisations when he ran for president of Interpol saying they feared the agency would be at risk of exploitation by repressive regimes.

He was nevertheless voted in as president in November following generous funding from the UAE for the Lyon, France-based body.

There were also accusations that Abu Dhabi had abused Interpol's system of so-called "red notices" for wanted suspects to persecute political dissidents.

Raisi is under investigation by French prosecutors
Raisi is under investigation by French prosecutors AFP / Ozan KOSE

The probe against Raisi is being handled by the prosecution unit for crimes against humanity, genocide and war crimes, the sources said.

William Bourdon, a high-profile lawyer acting for the GCHR, said it was "totally incomprehensible" that the prosecutors had not immediately ordered Raisi's arrest which, he said, "they should have done given that he is in France".

The accusations were a sufficient motive to lift Raisa's diplomatic immunity which he enjoys thanks to an agreement between the French state and Interpol, Bourdon said.

GCHR boss Khalid Ibrahim told AFP he had been interviewed by French police on March 18.

"I told them the French Prosecutor is very slow in taking actions in relation to... very serious allegations of torture against against Maj. General Ahmed Naser Al-Raisi."

The United Arab Emirates donated tens of millions to Interpol
The United Arab Emirates donated tens of millions to Interpol AFP / Ozan KOSE

Two previous complaints against Raisi had been rejected on competency grounds by French prosecutors who said they could not prosecute unless the accused resided in France permanently or temporarily.

But in its latest filing, the NGO was able to show that Raisi was in Lyon in January and again in March, using his activity on Twitter as evidence.

Raisi was elected following three rounds of voting during which he received 68.9 percent of votes cast by Interpol member countries.

His four-year role at Interpol is largely ceremonial, with Secretary General Juergen Stock handling day-to-day management of the organisation.

Raisi joined the Emirati police force in 1980 and worked there for several decades.

His candidacy for the Interpol job prompted a series of protests, including from European Parliament deputies.

Several NGOs, including Human Rights Watch, said Raisi was "part of a security apparatus that continues to systematically target peaceful critics".

In a previous complaint against Raisi, British man Matthew Hedges said he was detained and tortured between May and November 2018 in the UAE after being arrested on false charges of espionage during a study trip.

Mansoor, meanwhile, has been detained since 2017 in a four-square-metre (43-square-foot) cell "without a mattress or protection against the cold" and "without access to a doctor, hygiene, water and sanitary facilities", while serving a 10-year sentence for allegedly threatening state security, according to his lawyers.

The UAE's foreign ministry rejected the complaints over Mansoor's detention conditions as "without foundation".

The UAE donated $54 million to Interpol in 2017 -- almost equivalent to the required contributions of all the organisation's 195 member countries which amounted to $68 million in 2020.