"He will remain in jail pending the case being handled by the public prosecution, until the investigation is concluded," prosecution chief Mohammed Salah said in a statement carried by state news agency BNA.
A Bahraini court had earlier ordered Rajab freed pending trial on charges of spreading false information, with the case to resume on January 23.
But Salah said Rajab was being questioned in another cybercrime case on a similar charge of "spreading false news about the situation in the kingdom."
"Sadly, my father will not be released," he wrote on Twitter. "Those oppressors already have another case ready for him. They dont want him out."
Rajab has been repeatedly detained for organising protests and publishing tweets deemed insulting to Bahrain's Sunni authorities.
He previously served two years in jail on charges of taking part in unauthorised protests in the Shiite-majority kingdom.
Disclaimer: No Business Standard Journalist was involved in creation of this content
You’ve reached 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
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


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
