Then it's a bit confusing that they said they were looking for a man dressed in black with white trainers if they didn't want to give a description.
Given the fact that the area is overwhelmingly white then saying the suspect was black would actually have been very helpful for the public to identify him.
I am also curious as to know how the investigation might benefit from launching a manhunt while at the same time actively withholding an accurate description of the suspect they are looking for?
On a more serious note, failing to provide a description at he earliest opportunity meant that the people who did spot "A Black man behaving suspiciously" in the area, some of whom actually confronted him, were put at severe unnecessary risk of injury or death! Had they known that he did match the description of the suspect they were looking for then these innocent bystanders could have kept their distance and called the authorities rather than putting themselves at considerable risk.