A 22-year-old man was arrested in connection with the fatal stabbing of Christina Edkins after a "short foot chase", West Midlands Police said.
Detective Superintendent Richard Baker added that the police were "not looking for anyone else" in relation to the case.
A 22-year-old man was arrested in connection with the fatal stabbing of a "bright and popular" teenager on a bus as she travelled to school.
The 16-year-old schoolgirl stabbed to death on a bus in Birmingham during rush hour has been named as Christina Edkins.
West Midlands Police have launched a manhunt after a 16-year-old girl was fatally stabbed on a bus in Birmingham on her way to school.