An Oxford University professor has been charged with two counts of rape, reports say.
The BBC reports that a French judge has placed Islamic studies scholar under criminal investigation.
The 55-year-old was reportedly questioned by police in Paris earlier this week and has now been remanded in custody.
Mr Ramadan took a leave of absence from Oxford when the claims initially surfaced in November.
The first of his accusers claims he assaulted her in a Paris hotel in 2012.
His second accuser, who claims he raped her in 2009, has remained anonymous.
Reports say four Swiss women have also accused the scholar of making sexual advances while they were students in Geneva.
Mr Ramadan has categorically denied all allegations, claiming they are part of a campaign by his enemies.