Only days after Mohamed Merah gunned down a rabbi and three children at Ozar Hatorah, a Jewish school in Toulouse, staff members there have received threatening emails and phone calls.

Michel Jacques, the city prosecutor, said an investigation to track down the sender has begun.

The email messages were signed, “The avenger of France and the French people,” according to AFP. They were sent to a few members of staff at the school on Friday. The shooting attack took place the previous Monday.

The emails were forwarded to French authorities for their offensive and anti-Semitic tone.

Other Jewish schools in Paris have also received threatening emails.

Jean-Paul Amoyelle, head of the Ozar Hatorah networks in France, said he feared further attacks.

On Tuesday, a 12-year-old Jewish student, wearing a kippa on his head, was attacked 100 yards from an Ozar Hatorah school in Paris, by a gang who shouted such anti-Semitic epithets as “dirty Jew” while beating him. He was not seriously injured.

Jewish graves have also been vandalized in Paris.