Camera clue in French manhunt The killer of three children and a teacher gunned down at a Jewish school in southern France was wearing a video camera round his neck to film the attack - but his identity was still unknown to hundreds of police hunting for him on Tuesday. Claude Guéant, the interior minister overseeing the investigation, said: "For the moment there are not the elements that allow us to say we are close to an arrest ... We don't know today who he is. The same gunman is also believed by the authorities to have killed three French paratroopers, at least two of whom were Muslims, in two similar attacks in the Toulouse area last week. All seven victims were killed by the same .45 calibre handgun by a helmeted assailant who arrived and escaped on a powerful stolen Yamaha scooter. Mr Guéant said one line of inquiry concerned three soldiers expelled for neo-Nazi activity four years ago from the same paratroop regiment garrisoned near Toulouse that the dead soldiers belonged to. "They may have had a desire for revenge," Mr Guéant said, but he stressed: "It is one lead, but among others. It is not specially favoured. However a police source told Reuters the three men had been eliminated from their inquiries. The interior minister added that the killer wore a video camera strapped round his neck which "would allow the recording of images which could later be shown on a computer." "This shows a profile of the murderer as someone who is very cold, very determined, very in control of his actions and very cruel," Mr Guéant said. Monday's attack, in which a Hebrew teacher and two of his small children and the daughter of the school director were killed, shocked the country and abruptly interrupted campaigning for next month's presidential election. A minute's silence was held in schools across France on Tuesday morning as a mark of respect for the victims. President Nicolas Sarkozy, who placed the Midi-Pyrénées region of which Toulouse is the capital on the nation's highest security alert and deployed troops to guard places of worship and religious schools, observed the minute's silence at a school in Paris. "What happened in Toulouse took place at a religious school, with Jewish children and families, but it could have happened here," he told the pupils. It is an event of such gravity that the whole republic must be concerned. Mr Sarkozy wrote to Benjamin Netanyahu, the Israeli prime minister to assure him of his "total determination" to capture and bring the gunman to justice, the Elysée palace said. The bodies of the school attack victims, who had dual French and Israeli citizenship, were due to be flown to Tel Aviv on Tuesday. Mr Sarkozy has said the attack was clearly an act of anti-semitism, but he has been careful not to point the blame at any organisation or faction. He and François Hollande, the opposition Socialist candidate and his main rival, cancelled all campaign events on Tuesday. But some other candidates said they would resume campaigning. François Bayrou, the centrist candidate who came third in the 2007 election, linked the killings to what he called a climate of intolerance. The election campaign to date has been marked by a heated debate over immigration and integration of immigrants into French society. "I don't think of these events in electoral terms but in national terms," he said. We must put an end to this growing climate of intolerance.