The widow of a bodyguard killed at the offices of Charlie Hebdo wants an investigation into what she says were lax security measures at the French satirical newspaper before it was attacked a year ago.

Ingrid Brinsolaro said on RTL radio Tuesday that her husband "saw dysfunctions" and a lack of security in the office targeted and "it was impossible to do his job correctly."

Interior Minister Bernard Cazeneuve said he was open to the idea of an investigation, but also defended the government's efforts to ensure security and fight Islamic extremism.

Both spoke as France marks a year since Islamic extremists targeted Charlie Hebdo and a kosher market Jan. 7-9, killing 17 people. French President Francois Hollande is unveiling plaques later Tuesday to honor the victims.