PARIS (AFP) Families of French engineers killed in a 2002 bomb attack in Pakistan have pressed for President Nicolas Sarkozy to testify over alleged corruption linked to the deaths. A lawyer for the families said Thursday they had lodged a demand with investigating magistrate Renaud Van Ruymbeke that he question Sarkozy, former president Jacques Chirac and former prime minister Dominique de Villepin in the case. Van Ruymbeke is investigating parts of a complex case linked to sales of arms to Pakistan that has spawned allegations of illegal political funding, implicating Sarkozys ally, former prime minister Edouard Balladur. Mr Sarkozy owes us this hearing, to say what he has to say - he who has described this financial investigation as a fairytale, Sandrine Leclerc, the daughter of one of the men killed, told reporters. The civil parties insist that Nicolas Sarkozy can be heard, even if he is covered by presidential immunity, said the families lawyer Olivier Morice. Nicolas Sarkozy must remove all ambiguity, he added. Under Frances constitution the president of the republic cannot be sued, tried or forced to testify during his mandate. Morice said however that he can testify voluntarily. Investigators suspect the bombing in Karachi in 2002, which killed 11 French engineers and at least three Pakistanis, was revenge for the cancelling of commissions for officials in the sale of submarines to Pakistan. They have also been investigating whether money paid in commissions ended up being channelled to fund political activities in France. Witnesses have told investigators Sarkozy approved the commissions as budget minister at the time. On Wednesday French former defence minister Charles Millon confirmed the existence of kickbacks on the deals in testimony to Van Ruymbeke, a source close to the matter said. Former president Jacques Chirac tasked Millon with ending kickbacks on arms contracts shortly after he came to power in 1995. Chirac asked Millon to proceed with revising arms contracts and to verify as much as possible if there were signs of the existence of kickbacks, the source said. For the Pakistani contract, looking at the secret service reports and analyses carried out by the (defence) ministry services, one has the absolute conviction that there were kickbacks, media quoted Millon as telling the judge. French investigative news website Mediapart in June quoted Luxembourg police as saying that a company set up with Sarkozys approval channelled money from arms deal commissions to fund political activities in France. Balladur and Sarkozy, who served as his campaign spokesman for the 1995 election, have repeatedly dismissed the allegations of illegal party funding. Sarkozy has not responded to the latest developments but previously dismissed the case as a grotesque fairytale. Families of the victims of the Karachi bombing will lodge a manslaughter suit against former president Chirac, their lawyer Morice said Friday. Their civil suit for manslaughter and endangering life also targets former prime minister Dominique de Villepin and former executives involved in arms deals linked to the case, Morice said. Our complaint is going to target how the decision was arrived at to stop the commissions, Morice told AFP, saying the suit was prompted by recent testimony from arms executives in the case. Investigators have been examining allegations of kickbacks since 2008. The state prosecutor, who unlike an investigating magistrate is under government authority, had previously said there were no grounds for a corruption probe. Morice alleged on Thursday that at the head of the state they are afraid of this case progressing because it implicates Nicolas Sarkozy and those close to him.