Indian law enforcement officials in the southern Indian state of Karnataka arrested several people Friday for having links to the Islamic State group. While details of the circumstances leading to the arrests and the identities of those held have not yet been made public, local media reports said at least four people were detained in and around the city of Bangalore.

A senior local police official told International Business Times that the arrests were made by the National Investigation Agency — a federal security agency. NIA officials were not available for comment at the time of publishing.

The arrests came as security officials across India are on high alert ahead of the country’s 66th Republic Day celebrations. Security has also been tightened across New Delhi, the country’s capital, amid threats of an imminent attack.

This is a developing story.