<sod >Witnesses said the two men 'bumped' into each other before 'several punches' were thrown on the westbound platform at Oxford Circus tube station. Passengers then reported hearing 'shots fired' at around 4.40pm, prompting police to storm the station and evacuate it.< eod>< sod > Witnesses said the two men 'bumped' into each other before 'several punches' were thrown on the westbound platform at Oxford Circus. Passengers reported hearing 'shots fired' at about 4.40pm prompting police to storm the station and evacuate it on one of the busiest shopping days of the year.< eod>