French police are engaged in a siege with a man they are reportedly "confident" was responsible for the killings of seven people in the south west of the country. Two elite officers reportedly suffered minor injuries during a shoot-out with suspects in the ongoing pre-dawn raid in the Croix-Daurade district of the city of Toulouse. AFP news agency - which said up to six shots were heard in the raid - is reporting that police believe the gunman responsible for three attacks that killed three children, a rabbi and three soldiers is inside the target building. Four people were killed during the shootings at Ozar Hatorah school A source linked to the probe also told the news agency that a man claiming to be linked to al Qaeda was holed up in the building. The agency said the suspect being sought was 24 and had previously travelled to the border area between Pakistan and Afghanistan, which has been known to house al Qaeda safehouses. French news channel BFM TV said the suspects were linked to an Islamist group which it identified as Forsane Alizza. Sky News' Robert Nisbet, in Toulouse, said: "We know that someone is inside the building. It could one person, it could be more than one person. "I understand this is a relatively poor suburb of Toulouse. Obviously, there is an intense pressure on French police to solve this crime." The killings atOzar Hatorah Jewish school on Monday followed the shootings of four soldiers - three of them fatal - in two attacks over the previous eight days. All three of the soldiers killed were of North African descent. All of the attacks were apparently carried out by an assailant using the same gun and scooter. The victim's backgrounds had led to fears the killer was specifically targeting members of minority communities. Chief prosecutor in Paris, Francois Molins, who is monitoring the investigation in Toulouse, had warned there could well be more killings. "At this stage, everything is being done to identify, find and stop the perpetrator, of these three killings as fast as possible," he said. "In these exceptional circumstances, I think it is obvious that we are up against an extremely determined individual, who knows he's being hunted, who could strike again."