France investigates neo-Nazis after school killings President Sarkozy tells Paris schoolchildren the victims were just like them Interior Minister Claude Gueant says authorities are probing possible neo-Nazi involvement The gunman who killed 4 at a Jewish school was wearing a camera, the minister says Southwest France remains on scarlet alert, the highest terror threat level Toulouse, France (CNN) -- Authorities are investigating the possibility that neo-Nazis are behind a shooting spree that left three children and a teacher dead at a Jewish school in France, Interior Minister Claude Gueant said Tuesday. That is one of several leads authorities are following after the Monday killings -- the third fatal attack on people from minority groups in the south of France in the space of eight days. The country's southwest region remained on scarlet alert, the highest possible level, after the teacher and three children were gunned down at the Ozar Hatorah school in Toulouse. The gunman at the Jewish school wore a camera on his chest during the attack, Gueant told Europe 1 in an interview Tuesday. The minister said a witness had told authorities about the device. Gueant did not know if the gunman recorded the attack. France observed a minute of silence in memory of the victims on Tuesday, with President Nicolas Sarkozy marking it at a school in Paris. This happened in Toulouse, in a religious school, to children from Jewish families, but it could have happened here. It could have been the same assassin. These children are exactly like you," he told the pupils. Sarkozy, who is running for re-election, has suspended his campaign in light of the wave of violence against minorities. One of the guns used Monday was also used in killings of French soldiers of north African and Caribbean origin on March 11 and March 15, said Elisabeth Allannic, a spokeswoman for judicial authorities in Paris. It is the first time a scarlet alert has been declared in France, French media reports say. The status means the state can implement sweeping security measures to guard against an imminent threat of major terror attacks. Measures include increased security at schools, extra surveillance of Jewish and Muslim sites, restrictions on traffic and access to public buildings, additional police on duty and extra scrutiny of passengers and baggage at mass transit centers, the local Haute-Garonne authorities said in an online statement Monday. Fance has a complex history with the far right. There has been steady if minority support for the National Front party founded by Jean-Marie Le Pen and now led by his daughter Marine. The senior Le Pen came in second in presidential elections in 2002, and his daughter is a candidate this year. Sarkozy himself said in an interview earlier this month that France has too many immigrants. "Our system of integration is working worse and worse, because we have too many foreigners on our territory and we can no longer manage to find them accommodation, a job, a school," he said in an interview on France 2 TV on March 6. The bodies of the four victims of the school shooting will be flown to Israel for burial, according to the Israeli government. The teacher was shot dead with his two children. The daughter of the school's director was killed in front of him. The gunman pulled up in front of the Jewish school just before 8 a.m. on Monday and started shooting, authorities said. The gunman wore a motorcycle helmet and fled on a motor scooter after the shootings, interior ministry spokesman Pierre-Henry Brandet said. The same method was used in the earlier soldiers' shootings. France, which has one of the largest Jewish populations in Europe, had 389 reported acts of anti-Semitism in 2011, according to the Representative Council of Jewish Institutions in France, known by the French acronym CRIF. The group later issued a statement saying that, while it is too early to determine definitively the motive for the "horrible" crime, it appears to be a case of anti-Semitism. But we take everything very seriously," said Mayor Michael Bloomberg. CNN's Anna Pritchard and Dheepthi Namasivayam contributed to this report.