CALGARY - Shell Canada says it has offered to renew negotiations to sell its refinery in Montreal, which is slated to close unless a last-minute deal is arranged.

The oil giant wants a quick response from a subsidiary of Israel's Delek Group, which had expressed interest previously but backed away.

About 500 employees and up to 400 contractors work at the refinery in east-end Montreal and an estimated 2,500 indirect jobs rely on its operations.

As a result, the planned closure has become a political issue and Shell is under pressure to find an alternative.

Delek previously walked away from talks to acquire the 77-year-old facility because of the heavy maintenance costs required.