There are claims Melbourne CBD killer CHRISTPHER WAYNE HUDSON is linked to an alleged drug ring being run out of Barwon Prison.

Some newspapers are reporting the allegation after four guards from the prison were arrested yesterday.

Two have since been charged.

It's the latest in a string of incidents at Barwon but Acting Corrections Victoria Commissioner JAN SHUARD denies there are security problems at the Lara jail:

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A 40-year-old prison guard from Grovedale is facing a string of charges, including drug trafficking and misuse of public office, while another 40-year-old officer from Norlane's charged with possession.

They've both been bailed until September.

A 31-year-old female guard from Norlane, and two men from Norlane and Delahey who don’t work for Corrections Victoria, have all been released pending further inquiries.

Acting Deputy Police Commissioner JEFF POPE says it follows a long-running investigation:

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