She was the latest in a series of suspected IS sympathisers detained in Spain since last year over security fears.
Police said she was suspected of recruiting other women via the Internet to the group, also known as Daesh, which has claimed numerous kidnappings and executions.
At the time of her arrest early today in the coastal town of Gandia near Valencia, she "was making the last preparations for her journey" to Syria, a police statement said.
More than 100 people from Spain are suspected of having joined jihadist fighters in Iraq and Syria, and authorities fear they may return to launch attacks.
In March 2004, Al-Qaeda inspired bombers blew up four packed commuter trains in Madrid, killing 191 people.
More than 20 people including various Moroccans were convicted of that attack.
Police said the woman detained today was Moroccan but had lived for a long time in Spain.
"She spread jihadist ideology on the Internet, justifying terrorist acts and spreading videos that glorified executions of people," it said.
"She had focussed her online activity on recruiting women to go and swell the ranks of Daesh.
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
