Investigating officer Det Insp Andy Howard said: “We are keen to talk to anyone who was in Vulcan Drive yesterday in the early evening and saw anything suspicious.
“We are not looking for anyone else in connection with this incident but are trying to piece together what happened.
“In particular, we would like to speak to a group of youths who were outside at about the time of the incident."
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More than 200 guns were handed in to police during a regional gun amnesty this month.