A lone motorcycle gunman opened fire with two handguns near a Jewish school in the southern France city of Toulouse Monday, killing three children and one adult.
The attack at the Ozar Hatorah school took place at about 8 a.m. local time, just before classes were to start.
Rabbi Yonatan Sandler, 30, from the Kiryat Yovel neighborhood in Jerusalem, and his sons, Gavriel, 6, and Aryeh, 3, were killed.
Miriam Monsonego, the 8-year-old daughter of the school's principal was the fourth victim. A 17-year-old was critically injured.
Nicole Yardeni, a local Jewish official who saw surveillance footage of the attack, said the gunman targeted children and "was looking to kill."
One of the guns used in the attack has also been linked to two other deadly attacks last week in the area.
France is home to Europe's largest Jewish population, estimated at 500,000. About 20,000 Jews live in Toulouse.
French President Nicolas Sarkozy was rushed to the school after the attack, calling it "a national tragedy."
Interior Minister Claude Gueant ordered all Jewish schools in France to increase security.
In Washington, the White House said it was deeply saddened by the "unprovoked and outrageous act of violence."
Investigators are now studying the evidence for terrorism links.