have firedÃo paulo tear gas at protesters who gathered to support a subway workers strike.that strike began five days ago and has crippled brazil's biggest city ahead of thursday's world cup opening match between brazil and croatia. most metro stations have been closed since. the workers have vowed to remain on site indefinitely. their demands have been refused. they have been told they will be sacked if they don't turn up for work today. >> there is a huge backlog of traffic continuing to clog up the roads. striking subway staff stood their ground with the union vote to remain firmly on strike despite a labor court ruling demanding a fine for each day off the job. >> is to residents who are suffering because the subway serves almost 4.8 million passengers a day. without the workers getting anything -- >> staff have brought down their first demand for a 16% pay raise to 12%. they are offering only 8%. >> this offer gives no room for resolution. the strike will continue. >> the strike is in its fifth day. the city of 20 million people has already been struggling with massive