BENGALURU: The nine people who were picked up from the Kempegowda International Airport here late on Friday after being deported from Turkey for allegedly trying to enter Syria to join terror outfit ISIS , were released on Sunday. The police said all of them had given an undertaking saying they would not indulge in any such terror-related activity in future.The people released were engineers Ibrahim Nowfal (24) from Hassan in Karnataka, Javeed Baba (24) from Khammam district in Telangana, and Chennai resident Muhammed Abdul Ahad (46), his wife and their five children.The Bengaluru city police, Andhra Pradesh police and intelligence agencies interrogated them for over 30 hours before letting them off. The city police also questioned the family members of Nowfal. They said the group intended to join ISIS, but was not involved with the outfit in any way.Sources said all the nine had travelled to Turkey on December 24 on tourist visas and were caught by the local police at the border.The police said Ahad has a master's in computer science from Kennedy-Western University, California and worked in the US for more than 10 years. Ahad, who had left India soon after his engineering, is settled in the US. Two of his children are US citizens, but he still holds an Indian passport.In December, the Bengaluru police had arrested Mehdi Masroor Biswas from the city for operating a pro-ISIS Twitter handle. Biswas owned @ShamiWitness, which had 17,700 followers.