PARIS — French authorities have arrested the administrator of an extremist French website who is suspected of playing a key role in financing and recruiting for al-Qaida and other terrorist groups from Pakistan to Spain, the Paris prosecutor's office said Tuesday.

The man — whom prosecutors call an "operational vector and formidable financier of the bloodiest terrorist groups" — is being questioned Tuesday. He faces preliminary charges of planning terrorist acts and financing a terrorist enterprise, the prosecutor's office said in a statement.

The man, a Tunisian born in 1977 based in the southern French city of Toulon, was arrested Friday after a yearlong investigation, the prosecutor's statement said. It did not give the man's name.