The elite Special Forces have joined counter-terror police and 1,900 Army personnel in the biggest security operation since the 2012 London Olympics.
The news comes as Al Qaeda warned that France was only its third preferred target after Britain and the US.
Most of the Special Forces will be wearing civilian clothes, while some have donned police uniforms to accompany police officers who visit the homes of persons of interest in response to intelligence leads by MI5.
The security operation was rolled out after the Paris atrocities, in which 17 people, including three police officers, were killed as Islamic gunmen ran amok across the French capital over three days.
Our IP Address: