Det Ch Insp Larkin asked the public to come forward
with more information
A boy of 14 and an 18-year-old man have been arrested by police investigating three sexual assaults near the University of Manchester.
Police had earlier released an e-fit if a boy, who they said could have been as young as 12, who they believed may have carried out the attacks.
The police said they would continue to investigate the "appalling incidents" to establish who is responsible.
Two of the assaults occurred on 21 September and the third on 5 October.
In the first incident, a 27-year-old was approached from behind and grabbed in Lloyd Street North at 18:15 BST.
The woman screamed and the offender, who was described as being in his mid-teens and mixed race, threatened her.
He grabbed her again before running away.
The next incident followed minutes later in Oxford Road when a 21-year-old woman was approached by a boy who made lewd comments as she left John Rylands library.
She carried on walking on Moss Lane East and was sexually assaulted by her assailant.
The third attack took place at the Manchester Science Park in Lloyd Street North at about 14:15 BST on 5 October.
A 32-year-old woman was using her mobile phone when she was approached by two young boys.
She was sexually assaulted by one of the boys, who was described as being slim, Asian, wearing baggy trousers and carrying a rucksack, and aged about 12 or 13 years old.
She pushed him away but he sexually assaulted her again before running off towards Pencroft Way with the second young boy, who was also described as being Asian.
Det Ch Insp Colin Larkin said: "These crimes have shocked everyone and I am pleased to say that we have now made two arrests.
"I would like to thank members of the public and the media for their support and the information they have provided and as a result, we are now in a position where two people are in custody and are being questioned.
"However, we still remain in the early days of this investigation and there is still a lot of work to be done. I want to reassure the community that, whilst we have made arrests, we will continue to investigate these appalling incidents so we so can establish all the facts and who is responsible."
He added that he would like anyone who has any more information about the three attacks or any other incidents to come forward.