The accused was identified as Siraj Rehman.
He was arrested from Mumbra area, reports said.
The police said they are searching for the remaining two accused.
Meanwhile, the second accused in the Mumbai gangrape case, who was arrested from a video parlour in South Mumbai on Saturday morning, has confessed to his crime, said police.
According to the Mumbai Police, Vijay Jadhav was hiding at the video parlour near his residence in South Mumbai.
"We have arrested the second accused in the case this morning. He has admitted his crime," Mumbai Police Commissioner Satyapal Singh told reporters.
A Mumbai court on Saturday remanded the first accused in the Mumbai gangrape case - Chand Babu Sattat Shaikh alias Mohammed Abdul - to police custody till Aug 30.
Nationwide outrage poured out on Friday after a 22-year-old photojournalist was raped by five men on Thursday evening in south Mumbai, sparking memories of the brutal gangrape of a woman in Delhi last December.
All five of the suspects were identified and their sketches have been released, police said following the arrest of Chand Babu Sattat Shaikh alias Mohammed Abdul (19), a resident of South Mumbai who is unemployed.
According to the police, the 22-year-old photojournalist and a male colleague, who were interning with a city publication, entered Shakti Mill in Central Mumbai at 6 p.m. on Thursday.
Two of the accused accosted them and accused the interns of trespassing on railway property and on the pretext of taking the two to officials, the accused separated them.
The young man, who had a camera, was hit with a belt and tied up while the photojournalist was dragged behind some trees 15-20 feet away.
The duo called three others and took turns to rape the woman, assaulting her and eventually knocking her unconscious.
The incident brought back the memories of the Dec 16 fatal gangrape in New Delhi.
On Dec 16, six people gangraped and brutalised 23-year-old Jyoti Sharma with an iron rod on a moving bus in New Delhi. The victim succumbed to her injuries at a Singapore hospital on Dec 29.
The incident triggered nationwide outrage against rising cases of crime against women in India with people pouring into the streets of New Delhi for days and demanding a change of law and strict punishment of the accused.
--IBNS (Posted on 24-08-2013)