The weekly, published on Thursday, said the Ministry of Justice has asked the US to help investigate the activities of the far-right news portal kuruc.info as well as the Arrows of Hungarians National Liberation Army, which is allegedly linked to it.

The "Arrows" have claimed responsibility for a series of petrol bombings of houses of Socialist MPs earlier this year and for assaulting and seriously beating a TV presenter late last year.

The Hungarian authorities are "groping about in the dark," said the paper, and they are even uncertain about the existence of the organisation.

The attackers' e-mails claiming responsibility originated from the same US-based server which hosts kuruc.info, a far-right website in ideological kinship with terrorists.

Hungary first turned to the US last year when the news portal published the names, phone numbers and photographs of Hungarian judges. The request was rejected on the grounds that US laws do not qualify the publication of personal data as a crime as long as it does not involve incitement for violence.