Paris - French President Nicolas Sarkozy has filed a complaint against unknown persons after a letter containing death threats against him and another politician was sent to the city hall of the southern city of Beziers, the daily Midi Libre reported on Tuesday.

"This is a normal procedure," Sarkozy's office said after the letter threatening the lives of the French president and Beziers Mayor Raymond Couderc, and containing a 38mm bullet, was delivered on February 9.

Police are examining Couderc's agenda and comparing the letter with a similar one, sent in 2007 and threatening another mayor in the region, the daily reported. (dpa)