Four students and two adults were injured when a school bus crashed Monday afternoon in Union County, authorities said. Officers were called to the intersection of W 7th Avenue and Washington Avenue in Roselle at 3:10 p.m. and found that a J&J School bus had crashed into a telephone pole, causing downed wires and damage to the pole and bus, according to a release from the Roselle Police Department. Authorities said the driver tried to step on the brakes but the bus unexpectedly accelerated, leading it to veer of the road and crash, police said. It was unclear if the bus was contracted by the R…