The arrested were identified as Satbir Singh, Rakesh Jha, Narrendra and Pintoo, all residents of Delhi and aged between 27 and 35 years.
Police said that they solved a robbery case in which one Shiv Dayal, a resident of Budh Vihar area, was robbed of his cab, Rs 12,000 and mobile phone.
Police said that accused on March 3 booked a cab, owned by Dayal, from Kashmiri Gate to Karnal. On the way, they robbed him at knife point. The gang used the modus operandi to rob others taxis too.