Police say they're "anxious" to arrest Vancouver Mayor Gregor Robertson's foster son, who is wanted on drug and weapons charges.

Jinagh Navas-Rivas is one of five men charged after an RCMP investigation into a dial-a-dope operation offering cocaine in Richmond. The 21-year-old, who lived with the mayor's family for two years, is still at large, and a warrant has been issued for his arrest.

"We're anxious to locate and arrest him," Sgt. Peter Thiessen told reporters Friday.

Navas-Rivas is charged with two counts of cocaine trafficking in Richmond and Vancouver and one count of transferring a .22-calibre Ruger pistol with ammunition in New Westminster.

Robertson is currently on vacation in Hawaii, but issued a statement saying he was "disappointed" to hear of the charges and urging Navas-Rivas to turn himself in to police.

Navas-Rivas hasn't lived with the Robertsons since moving out on his own in 2009, but is still included in family events. When the mayor won his re-election bid in November, Navas-Rivas joined the family on stage for the victory speech, and was included in Robertson's thank-you to "my kids."

Mounties say their investigation into the drugs-and-guns trafficking ring began in June. Since then, police have seized three handguns with ammunition, 15 ounces of cocaine and a pound of marijuana, as well as steroids and MDMA.

Also charged in connection to the investigation are 25-year-old Vinh Hoang David Le, 23-year-old Willie Sing Cheung Truong, 47-year-old Raymond Kwok Pui Ma and 29-year-old Leslie James Miller, all Vancouver residents.

Truong turned himself in to police Friday afternoon and was released from custody on strict conditions after a brief court appearance. Miller appeared in court Wednesday and is being held in custody until his next appearance on Jan. 5.

Police are asking for the public's help locating the remaining three suspects.

Investigators say they expect to identify and charge another three people suspected of being involved in the operation.