HOUSTON, Feb 19 (Reuters) - Union negotiators on Thursdayrejected the latest contract offer from oil companies and saidthe largest U.S. refinery strike since 1980 may spread to moreplants beyond the 11 where walkouts are underway.
The United Steelworkers union (USW) said in a message tomembers and news media that the latest proposal from lead oilcompany negotiator Royal Dutch Shell Plc failed toimprove safety at refineries and chemical plants in an "enforceable way."
The union also told workers not on strike to be prepared towalk out in the coming days. (Reporting by Erwin Seba)