The attack happened in Holloway Head
A woman has been seriously sexually assaulted in Birmingham city centre, police have said.
The attack on a 19-year-old woman happened at around 04:40 GMT in Holloway Head.
Det Insp Ian Ingram said: "Detectives have launched an investigation and part of the road is currently cordoned off while inquiries continue."
West Midlands Police asked anyone who may have any information to contact them.