Adnan Hussain, who hails from Karnataka, Mohammad Farhan from Maharashtra and Sheikh Azhar Al Islam from Jammu and Kashmir, who were arrested yesterday by the NIA after being deported from the UAE, were produced before the court in muffled faces amid tight security.
The trio were detained by the NIA on arrival from the UAE at the IGI airport here last night.
The sources said District Judge Amar Nath allowed the NIA's plea and remanded them to its custody till February 9.
The three suspects, along with other unknown associates, were allegedly involved in a conspiracy to identify, motivate, radicalise, recruit and train Indian citizens, located in India and abroad, for planning and executing terror attacks in India and other countries, the sources claimed.
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On September 15 last year, the UAE had deported four Indians suspected to have links with ISIS (Islamic State of Iraq and Syria).
In January 2015, Salman Mohiuddin of Hyderabad was arrested when he was preparing to board a flight to Dubai on way to Syria via Turkey.
According to Indian intelligence agencies, around six Indians who had joined the ISIS were reportedly killed in different incidents in Iraq and Syria.