The arrested were identified as Anar Singh, Paramveer Mayur, Kamal Kishore, Punit, all residents of Delhi, Amit Tyagi of Uttar Pradesh and Haryana-based Jai Karan.
Main accused Dinesh Pahalwan is yet to be traced so far, police said, adding that he has also filed an anticipatory bail before a local court here.
Three persons, including a police constable, were injured when armed men, said to be associated with Dinesh Pehlwan gang, attacked Rasoi Restaurant at L-block in Dilshad Garden last month when restaurant owner Harish Gupta asked them to pay their bills of last five months.
Pawan Choudhary, Manish and Bhola were the other attackers, who were identified in CCTV footages, they said. Efforts are on to nab them.
For past months, the gang members used to eat at the restaurant but refuse to pay bills.
On October 22, they again visited the eatery but had an argument with the restaurant owner when he asked them to pay their bills, police said. Dinesh and his associates returned to the restaurant and went on a rampage there.