The accused, identified as Niklesh Patil (24, from Nagpur) and Akshay Walode (25, from Ambernath), were arrested yesterday by Ratnagiri police for the incident that took place in the early hours on September 4, police said.
The 20-year-old victim's father, a policeman from Nagpur, has lodged a complaint with Shivaji Nagar police station in Ambernath in Thane district.
According to police, the victim, who hailed from Nagpur, was doing internship with a firm in Mumbai. On Sunday night, Patil decided to drive her to Mumbai from Pashan in Pune, where she had gone for some work. On the way to Mumbai, they decided to stay at Valode's place in Ambernath.
Thereafter, they stuffed her body into a suitcase and transported it to Kolhapur and dumped it by roadside.
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However, the duo later surrendered before Ratnagiri police, after which they were arrested.
An official release by the Thane city police said that the duo have been booked under IPC sections 376 (2)(g) (gangrape), 302 (murder), 201 (destroying evidence) and others, police said.
Further details in the case are awaited.