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Several shots were fired shortly after mourners left the cemetery.
Mr Khan, known as Ronnie, was shot near the junction of Forest Hill Road and Rockells Place at about 1500 GMT.
He was pronounced dead at the scene, and a post-mortem examination gave the cause of death as a single gunshot wound to the abdomen.
A 17-year-old boy was taken to hospital after he was shot in the ankle.
At least 50 people attended the service, including both shooting victims, detectives said.
Two 17-year-old girls and two 20-year-old men who were arrested over the incident were bailed until late November.
Last week police said the boy whose funeral it was had "contact with gang members".
Det Supt Gordon Allison said: "From our point of view we were obviously aware that the funeral was taking place and contingencies were in place to manage anything that might have come out of that."
Appealing for witnesses, acting Det Ch Insp Brian Lucas said: "These criminals shot at innocent people in the street.
"It is vital that we find out who they are and stop them from causing further harm to innocent people and to our communities."
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