"I would like to thank the public for their ongoing support and the way in which they responded to our appeal.
I appreciate that there is significant disruption whilst experts search and check this area. These road closures are essential to ensure that we keep everyone safe.
Investigations like this are complex and we need to ensure that we obtain every piece of information or forensic evidence possible. This could take some time. What I can say is that we will endeavour to return the local area to normal as quickly as possible."
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Steven Banford and other youths threw stones at them and verbally and racially abused them in the street.
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Harry Street, formerly Barry Williams, shot dead five people in a spree across the West Midlands in 1978.