French opposition leader Nicolas Sarkozy took aim at President Francois Hollande on Wednesday, claiming he had failed to take adequate security measures after the jihadist attacks in January, according to AFP.

The latest attack on Friday night which left 129 people dead has increased political tensions just weeks ahead of regional elections, and the brief semblance of national unity has quickly frayed.

"How many victims must there be before we use the word (failings)? Were all the implications considered after the January attacks? The answer is no," Sarkozy asked in an interview with Le Monde newspaper.