The National Investigation Agency (NIA) has arrested around 25 people from different parts of the country in an anti-terror operation ahead of Republic Day celebrations. 

While the arrests have been made over a period of several days, an NDTV report said NIA also arrested four suspects from Hyderabad on Friday. 

The chain of arrests has already led security agencies to sound alert in national capital New Delhi and other major

Source: b'Four ISIS suspects arrested in Uttarakhand | Source: PTI'

According to The Hindu, the network of suspects, reportedly linked to the Islamic State, was planning to carry out a series of bomb blasts across the country.  

NIA raids in Hyderabad were also followed by arrests in Rajasthan and Karnataka conducted on Thursday night.

On Wednesday, the Delhi Police arrested four men from Uttarakhand for alleged links to the ISIS after being under a month-long police surveillance for visiting ISIS propagandist sites.

On Thursday, French consulate in Bengaluru had received a letter warning against President Hollande's visit to India on Republic Day. 

Feature image source: AFP/Representational Image