A Delhi court extended NIA custody of Yasir Ahmed Dar by 10 days and Dr Bilal Naseer Malla by eight days.
NIA alleges Umar-un-Nabi planned the Red Fort blast and was aided by the accused through logistical support and harbouring.
Nine people, including multiple doctors, have been arrested so far in the case linked to the November 10 terror attack.
A court here on Friday extended the NIA custody of two accused in the Red Fort blast case.
Additional Sessions Judge Prashant Sharma allowed the probe agency to quiz the accused Yasir Ahmed Dar in its custody for ten more days, while the other accused Dr Bilal Naseer Malla will be quizzed for eight more days.
Media persons were barred from covering the proceedings. According to the National Investigation Agency (NIA) investigations, Umar-un-Nabi, who was driving the explosive-laden car that detonated outside the Red Fort on November 10, was the alleged planner of the terrorist attack that left 15 people dead.
The National Investigation Agency (NIA) arrested Dr Malla in Delhi on December 9, calling him a key accused in the conspiracy.
According to the NIA investigations, Naseer had knowingly harboured Umar-un-Nabi by providing him logistical support. He is also accused of destruction of evidence related to the terrorist attack, the agency stated earlier on December 9.
On December 18, NIA arrested Dar, the ninth accused in the case. He is a Jammu and Kashmir resident and allegedly a close associate of Umar-un-Nabi.
The NIA has arrested nine people, including Dr Muzammil Ganaie, Dr Adeel Rather, Dr Shaheen Sayeed, in the case.
