The investigators wanted to ascertain if the siblings had any attempts to trigger blasts in the past and indulged in other subversive activities.
The Anti-Terrorism Squad, which sought 14-day custody of the duo, said it also wanted to find out if there is any sleeper cell of the ISIS in the state.
Judicial Magistrate R A Singh, however, granted 12-day custody of Waseem Ramodiya and his brother Naeem, who were arrested yesterday.
The ATS wanted to find out from the duo whether they had in the past made any attempt to carry out blasts or indulged in other anti-national activities.
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Listing reasons for seeking custody of the duo, ATS ACP Ramesh Faldu told the court it also wanted to find out if ISIS sleeper cells are active in Gujarat.
Wasim and Naeem, who hold MCA and BCA degrees respectively, were allegedly in contact with ISIS handlers and were planning to target religious places like Chotila.
Police had been keeping a close watch on their activities since last three months, as they were found to be in contact with ISIS through Skype and other social media platforms.
Investigation has revealed that the two had allegedly planned to attack a famous temple at Chotila town in Surendranagar district and to trigger blasts at different places and set on fire vehicles.
They planned to record and upload the video of the attack on social media, to spread terror.
Police had claimed that the duo were held just in time, as they had hatched a plan to carry out bomb blasts at some religious places.
According to ATS, the brothers were in touch with some unknown handlers of ISIS based in Iraq and Syria and had plan to escape to these countries after carrying out attacks here.
Attracted to ISIS two years back, they were in contact with the main ISIS persons as well as unknown handlers to get guidance.
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