<sod >The force said aÃÂÃÂ "group of males" were reported spraying "what is believed to be a noxious substance" and six people were injured in a number of locations.< eod>< sod > The force said a "group of males" were reported spraying "what is believed to be a noxious substance" and six people were injured in a number of locations throughout the centre.< eod>