According to the police, they are not ruling out the possibility of role of an insider in both the cases.
Paramaditya, Deputy Commissioner of Police (Central),said the eight assailants were yet to be identified.
Alleging police inaction, traders in Karol Bagh market held a demonstration in the morning and heavy police force was deployed there. The protest led to severe traffic jam in the area during the peak hours.
They showed guns at Shyamlal and three of his employees and tied them up together with a rope and allegedly took away Rs two crore from the shop, which the owner said to have withdrawn in the afternoon for business purposes, police said.
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The accused fled the scene along with the mobile phones of the victims.
Police said that the victims could not identify any of the five accused. It has collected CCTV footage of the area and also questioned neighbouring traders, zeroed in on few bad characters of the area whose names were not disclosed.
According to the police, the second incident took place at around 11.15 pm yesterday when a youth, who was working in a jewellery shop at lane 37 of Karol Bagh's Biadon Pura, was shot dead allegedly by three unidentified men.
It added that the shop's other two employees, who were there in the shop when Majhi was shot, were being questioned but they have not identified the accused as yet.
Police said that the three workers were threatened by the accused at the time of the incident but allegedly shot Majhi when he tried to raise an alarm.
Majhi belonged to West Bengal and was working in the shop for the past few years, the police official said.