Last night, a hit-and-run collision caused four people to be injured in Carlsbad. According to On Scene Video, A black colored four-door sedan occupied by adults and children was struck by an automobile believed to be a late model Mazda. The Mazda was reported to be speeding at a high rate of speed. All four people in the black sedan were injured and taken to Tri-City Medical center for the treatment of their injuries. The authorities are currently investigating the accident further.