France's Constitutional Court has released a list of 10 candidates, from Trotskyists to the extreme right, who have been approved to run in the country's presidential election.

Polls indicate conservative President Nicolas Sarkozy could be neck and neck with Socialist candidate Francois Hollande in the election on April 22, and a runoff expected on May 6.

But Monday's announcement about the candidates drew little public attention because of a deadly shooting in a Jewish school in southern France.

Sarkozy and Hollande both rushed to the Toulouse school, where an unidentified gunman killed a rabbi and three children. The same weapon was used in shootings of French paratroopers last week.