Updated at 9.30 a.m ET: At least four people, including three children and a rabbi, were shot dead by a gunman at a Jewish school in Toulouse, France, on Monday, officials said.
The killings – described as “a vision of horror” by a parent of a child at the school – happened just days after three French soldiers were shot dead in two separate incidents in the area and a French government minister noted “similarities” between the incidents.
Paris prosecutors said in a statement Monday that they were opening anti-terrorism investigations into all three incidents.
The shooter fled the private Ozar Hatorah school -- located in Jolimont district of Toulouse -- on a black scooter, NBC News reported, citing Le Figaro newspaper; other reports described the vehicle as a motorbike. Several other people were injured, two of them seriously, Reuters said.
French media said that security was being tightened at all Jewish schools in the country.
Toulouse prosecutor Michel Valet said the gunman killed a 30-year old Hebrew teacher, his two children aged three and six, and another child. A 17-year-old was also shot and in hospital for treatment.
"The attacker was shooting people outside the school, then pursued children into the school, before fleeing on a heavy motorbike," Valet told reporters.
The assailant used a heavy-calibre firearm and another weapon.
'I did not find my son'
Parents who witnessed the incident -- which happened shortly before 8 a.m. local time (3 a.m. ET), as children were being dropped off at the school -- described the scene.
"I saw two people dead in front of the school, an adult and a child ... Inside, it was a vision of horror, the bodies of two small children,'' a distraught father whose child attends the school told RTL radio, Reuters reported.
PhotoBlog: Images from the scene of the Toulouse school shooting
“I did not find my son, apparently he fled when he saw what happened. How can they attack something as sacred as a school, attack children only sixty centimeters [about two feet] tall?'' he added.
"It was terrible ... It felt like it lasted a long time," Charles Ben Semoun, a parent of a child at the school, told i-tele television, the Bloomberg news service said on its website.
Monday's shootings come days after three soldiers were killed in two separate shootings in the same area by a man who also escaped from the scene by scooter, Reuters reported. French TV station BFM said that the gun used in the attack at the school was of the same caliber as that used in the soldiers' shootings.
On March 10, a gunman on a motorbike shot and killed a paratrooper in Toulouse. Last Thursday, a masked gunman on a motorbike opened fire on three uniformed paratroopers at a bank machine in Montauban, about 30 miles from Toulouse, killing two and critically wounding the other.
French Interior Minister Claude Gueant, who reportedly broke off a visit to another part of France to go to Toulouse, said that "one can't fail to notice the similarities between the attacks on our troops in Toulouse and in (the nearby town of) Montauban and then this horrible attack on children this morning," according to a Sky News report.
French President Nicolas Sarkozy was also on his way to Toulouse Monday, NBC News said, citing local media reports. "This barbaric act cannot win... trust [the authorities] to find this killer. We will find this killer. We must practice calm and caution," he told TV cameras, according to an NBC News translation.
He also said he was "struck by the similarities between the modus operandi of today's drama and those last week even if we have to wait to have more elements from the police to confirm this hypothesis."
The World Jewish Congress President Ronald S. Lauder said in a statement emailed to NBC News that "Jews everywhere in the world are weeping in sorrow and disgust in the face of this despicable terrorist attack."
"Targeting children is a particularly sick and vile act, and nothing can justify it. This attack is an attack on all of us," he added.
Israel's foreign ministry also expressed dismay.
"We are horrified by this attack and we trust the French authorities to shed full light on this tragedy and bring the perpetrators of these murders to justice," Israeli foreign ministry spokesman Yigal Palmor told the AFP news agency.
NBC News, The Associated Press and Reuters contributed to this report.