QUETTA: At least three children were killed and one was injured as a dumper vehicle crushed them on Brewery Road on Monday. According to reports, four children suffered critical injuries as they were hit by a over-speeding dumper on Brewery Road. The injured were being taken to hospital when three of them succumbed to their injuries. According to doctors, condition of another injured was critical. The police said that the breaks of dumper failed causing the accident. The police have registered a case against the driver of the dumper and launched investigation into the incident.