Corrections is investigating allegations of illegal activity out of Christchurch Men's Prison workshop

It's claimed gang members have been manufacturing motorcycle accessories - then taken off-site.

The engineering workshop's been closed and Police have been notified and two prisoners have lost their jobs.

Custodial services commissioner Leigh Marsh says Corrections is carrying out a site-wide review to identify and stop any illegal activity.

He says enquiries continue into whether any staff were involved.