The assault, which took place on Sunday evening (29 September) left both victims with minor injuries.
A spokesperson for South Wales Police said: “We are investigating reports of an assault upon an 18-year-old man and a teenage female girl by a group of males which happened near the Zone H seating area opposite the Costa coffee outlet.
“Both victims suffered minor injuries in the assault.
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“Given the time of day we believe that there would have been several people in bus station area.
“If you can help, please get in touch with us.”
