The accused Pawan Gahalon was caught from Rohtak in Haryana yesterday based on the circumstantial evidence and strong suspicion, Government Railway Police Commissioner Prabhat Kumar said.
"He was brought to Mumbai and placed under arrest," he said.
Gahalon was produced before a railway court today which remanded him in police custody till May 17, police said.
According to police, the victim Preeti Rathi, who suffered acid attack on May 2, claimed she had spotted Pawan at Delhi railway station minutes before she boarded a train for Mumbai.
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However, police are yet to establish if he is the attacker or he gave contract to another person.
Police claimed that Pawan proposed marriage to Preeti, but she refused. This could have led Pawan to throw acid on the girl.
On May 2 Rathi, along with her father Amar Singh (55), her uncle Vinod Kumar Dahiya, and her aunt Sunita, got down from the Delhi-Bandra Garib Rath train at platform number three when she was attacked.
The BSc graduate had come here to join Armed Medical College's INS Ashwini Hospital as a nursing lieutenant.