Sewpersad told TimesLIVE that metro police searched several vehicles for firearms and a few drivers were charged for spinning their wheels.
"I know for a fact that SA police were there too and our instruction was to work with them. Our members and SAPS members were deployed undercover as well," Sewpersad said.
He said the unit would investigate all formal complaints on the conduct of its members at the funeral. "If we receive a formal complaint then we will investigate."
Periasamy, 30, was gunned down shortly after leaving the Virgin Active gym at Gateway Theatre of Shopping in Umhlanga on Thursday.
Periasamy and his elder brother Kevin, who operate a tow-truck and taxi business, were awaiting trial on drug-related charges.
Kalvin, the leader of the so-called "Bloods" gang, was recently released on bail from prison. His brother is still in prison and wasn't allowed to attend the funeral.
He was expected to appear alongside his brother and sister-in-law in court next month.