You (or someone less injured) can go back to the area and locate any and all CCTV cameras, either on the street, in buildings, or in stores.
For any that are pointing in the right direction, make subject access requests (SAR - you can find templates all over the internet) to obtain copies of the footage.
Feel free, after that, to make a complaint against the police for being lazy and incompetent.
You (or someone less injured) can go back to the area and locate any and all CCTV cameras, either on the street, in buildings, or in stores.
For any that are pointing in the right direction, make subject access requests (SAR - you can find templates all over the internet) to obtain copies of the footage.
Feel free, after that, to make a complaint against the police for being lazy and incompetent.