The arrests were made yesterday.
Amarchand was shot dead when he resisted a robbery bid near Shastri Nagar on the night of April 28, said Deputy Commissioner of Police (North) Jatin Narwal.
Amarchand, along with two co-workers, was returning to his employer in Gandhi Nagar after collecting Rs 3 lakh from Chandni Chowk traders when he was shot at, said the officer.
During investigation, police scanned CCTV footage and found that Amarchand and his co-workers were being followed by three persons.
A country-made pistol was seized from them.
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