MONTGOMERY COUNTY, Md. (DC News Now) -- A multi-vehicle crash involving a tractor-trailer is slowing down traffic in Montgomery County Tuesday afternoon. Halloween block party in Downtown Hagerstown offers treats, costume contests, more The crash happened on southbound Interstate 270. (Photo courtesy of Pete Piringer)(Photo courtesy of Pete Piringer)(Photo courtesy of Pete Piringer)(Photo courtesy of Pete Piringer)(Photo courtesy of Pete Piringer)(Photo courtesy of Pete Piringer)(Photo courtesy of Pete Piringer) The tractor-trailer had a ruptured fuel saddle tank and hazmat teams are pumping the remaining diesel, Montgomery County Fire and Rescue Service spokesperson, Pete Piringer, said.