The killing on June 22 had triggered a nationwide outrage.
Inspector Ramdas Patil of Sakri police station said the police questioned a relative of Naresh Indrajit Jaat with whom he was in touch on the phone.
Jaat's mobile tower location indicated he was somewhere in Dhule. The investigators arrived in the district this morning along with his relative. They asked him to call the accused and pursuade him to reveal his whereabouts, Patil said.
A statement released by the Government Railway Police (GRP) said that a team was sent to Dhule following on a tip- off that the accused was hiding there.
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He was arrested and would be produced before a court tomorrow, it said. The name of the accused was not given in the statement.
"We have arrested a person from Maharashtra," SP, GRP, Kamaldeep Goyal said.
The police had earlier arrested five persons including a Delhi government employee in connection with the killing of Junaid between Ballabgarh and Mathura stations onboard a Delhi-Mathura passenger train.
Junaid was stabbed to death while his brothers, Hashim and Sakir, were injured by a mob which also allegedly hurled communal slurs against them.
His brothers said the attackers had taunted and repeatedly called them "anti-nationals" and "beef eaters".
A reward of Rs two lakh had also been announced for information on identity of those involved in the killing.
The youth's body was dumped close to Asaoti village in Faridabad district.
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