Four women and a girl were arrested in France on suspicion of plotting an extremist attack on churches.
Messages on social media indicated that an act was planned for the Easter weekend in Montpellier, southern France, it was reported.
The investigation focused on a woman, 18, living in the town of Beziers, seven kilometres from Montpellier, who was arrested on suspicion of plotting an attack, Beziers mayor Robert Menard said.
She "boasted to neighbours" about watching ISIS videos, Mr Menard said.
Her mother and three sisters were also arrested, including one who is a minor.
It was not clear if the fifth person held is another relative.
Counter-terrorism police swooped after concerns were raised by social media posts indicating a possible attack over Easter, Le Parisien reported.
During a search, officers found documents linked to ISIS and "several bottles taped together", the newspaper said.
Mr Menard, who was alerted by police to the operation, said he had spoken to concerned neighbours of those arrested.
“They’re horrified. They fear it gives a bad image of this neighbourhood and the Muslim community here,” he said.
Officials said the French domestic intelligence service and national anti-terrorist prosecutor’s office were handling the investigation.
The five pillars of Islam
What can victims do?
Always use only regulated platforms
Stop all transactions and communication on suspicion
Save all evidence (screenshots, chat logs, transaction IDs)
Report to local authorities
Warn others to prevent further harm
Courtesy: Crystal Intelligence
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WHEN TO GO:
September to November or March to May; this is when visitors are most likely to see what they’ve come for.
WHERE TO STAY:
Meghauli Serai, A Taj Safari - Chitwan National Park resort (tajhotels.com) is a one-hour drive from Bharatpur Airport with stays costing from Dh1,396 per night, including taxes and breakfast. Return airport transfers cost from Dh661.
HOW TO GET THERE:
Etihad Airways regularly flies from Abu Dhabi to Kathmandu from around Dh1,500 per person return, including taxes. Buddha Air (buddhaair.com) and Yeti Airlines (yetiairlines.com) fly from Kathmandu to Bharatpur several times a day from about Dh660 return and the flight takes just 20 minutes. Driving is possible but the roads are hilly which means it will take you five or six hours to travel 148 kilometres.