The publication has received a series of threatening messages on its Facebook page since June 8, and on June 22 a hand-written letter was posted to the newsroom containing the same threats and the words "Allahu akbar" (God is greatest).
"No one has been arrested at this stage and investigations are ongoing," said the source.
Jihadist brothers Said and Cherif Kouachi gunned down eight Charlie staff as well as several others in and around the building in the attack on the magazine whose drawings of the Prophet Mohammed drew the fury of Muslims around the world.
All three jihadists were killed in police raids.
While the staff of Charlie Hebdo moved into new top-security premises, the magazine has continued to raise ire, refusing self-censorship in the wake of the attacks.
You’ve hit your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Access to Exclusive Premium Stories Online
Over 30 behind the paywall stories daily, handpicked by our editors for subscribers


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app