On expiry of their judicial custody, accused Farman, Sunder Singh, Pawan and Sunny Uppal were produced before Additional Chief Metropolitan Magistrate Pritam Singh who extended it by two weeks.
The case was transferred to CBI from Delhi Police for further investigation after the victim's parents had met Union Home Minister Sushilkumar Shinde and Congress vice-president Rahul Gandhi, demanding speedy justice for Tania.
They had alleged police negligence in the case and also demanded action against the guilty personnel.
Following the altercation, the shopkeepers had allegedly thrashed him. He was brought dead to AIIMS the next day.
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The death of Tania, son of a Congress MLA, evoked angry reactions from people of the northeast living in the national capital who alleged police had failed to protect him.
Police had booked all the four under Section 302 (murder) of IPC after the postmortem report showed Tania died due to injuries to his head and face caused by a blunt object.
On February 10, police arrested Sunny and slapped murder charge against all the four accused. Two minors, who also allegedly assaulted Tania, are facing an inquiry before the Juvenile Justice Board here.