Specialist teams were conducting a massive CCTV trawl as the investigation enters the fifth day.
Detectives are trying to trace the movements of a light-coloured car used by the attackers.
Footage from CCTV cameras across the South Side is being examined in a bid to map the movements of the gang.
Detective Chief Inspector Sharon MacGregor is leading the probe into the crime that shocked close-knit community in Toryglen.
She said: "Detectives are now examining information to establish if there are any new lines of inquiry which can be followed up.
"Officers are still in the process of gathering CCTV from in the area to try and obtain more detail about the suspects and the car."
The Evening Times told how a 33-year-old woman was dragged off a city street and gang-raped in a close at the weekend.
It is believed she was walking to a friend's home in Edinbeg Avenue when a man got out of a car and pulled her into a close.
Moments later, two other men joined him in attacking her.
Police said the three men were Asian and the car was light-coloured, possibly a white or silver BMW.
Meanwhile, detectives from Police Scotland's public protection unit have had an "encouraging response" from the public to a crime.
Detective Chief Inspector MacGregor said: "We have received an encouraging response from the public following the coverage in the media.
"I would still like to appeal to anyone who may have any information to get in touch with us as a matter of urgency.
"A small piece of information can be significant so please do pass it on."
Police have stepped up patrols to reassure locals after the attack, which took place at 3am on Saturday.
Anyone with any information is asked to call 101.