Murugesu Jayaganesh Pakeerathy, 41, was arrested on Monday when she was at the airport with her eight-year-old daughter, a French national, and initially detained for 72 hours pending investigations by an anti-terrorism unit, said police spokesman Ajith Rohana.
"We have now got a detention order under the Prevention of Terrorism Act which means we can hold her for a period of 90 days," Rohana told AFP.
"We are hopeful of completing investigations very soon."
The French embassy was providing consular assistance but gave no further details.
Police said the mother was believed to have been a leader of the Sea Tigers, the naval unit of the Liberation Tigers of Tamil Eelam (LTTE). She had been an active combatant between 1997 and 2000, Rohana said.
She had left the island in 2005, four years before the LTTE was crushed by troops in the bloody finale to a 37-year separatist conflict.
Her arrest comes despite an announcement by the new government of President Maithripala Sirisena that it would launch a fresh ethnic reconciliation process with the help of the international community.
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
