BEAUMONT (CNS) - An unknown substance seeping from a tractor-trailer parked in a loading dock at an Amazon warehouse in Beaumont Thursday, Feb. 16 sickened at least five workers and prompted a hazardous materials response.The hazmat emergency was reported about 4:40 p.m. at the warehouse at 36900 Fourth Street, on the extreme west end of the city, according to the Riverside County Fire Department.The agency said that multiple engine crews were sent to the location and found the semi at a loading bay cordoned off due to fumes."They're still trying to figure out what the source may be," fire department spokeswoman April Newman told City News Service.She confirmed that five people required medical treatment at the scene, but it was not immediately clear whether any of the vict
