B.C.'s top cop says security changes are underway at a Port Coquitlam prison, six months after a gangster walked out with a prison guard's help.

But Solicitor-General John van Dongen won't say just what the prisons are doing, citing security concerns.

"There's been a number of conclusions being implemented," said John van Dongen, B.C.'s new solicitor-general.

Last November, Omid Tahvili -- a man convicted of several gang-related charges -- walked out of the maximum-security North Fraser Pre-Trial Centre.

He walked out with prison guard Edwin Ticne, who has since pled guilty to helping Tahvili escape, admitting that he was promised $50,000 for his efforts.

Tahvili hasn't been seen since.

On Wednesday, B.C. Corrections released a series of short videos that show Ticne and Tahvili walking out together.

It was a video that prompted concern from security experts, who said there was no way that a good system would have let both of them walk out.

One expert, Leo Knight, said that there should have been greater checks at doorways.

"He should not be alone and there should be somebody else to engage and disengage that lock," said Knight.

But B.C. Corrections spokeswoman Lisa Lapointe says that it won't happen again.

"This is not a chronic problem, this is something that happened we've identified," she said. "You won't see another escape this time."

With a report from CTV British Columbia's Lisa Rossington