The cause of the accident was not immediately known.

(Representational)Reykjavik, Iceland: Three people were killed in southern Iceland on Thursday when their jeep plunged off a bridge into a dry river bed, police said, as local media identified the dead as British nationals.Seven people were in the car that fell about six metres (20 feet), "and three of them did not survive the accident," South Iceland police commissioner Grimur Hergeirsson told AFP."The other four were transported by helicopter to hospital in Reykjavik," he said.Local media reported that one of the dead was a child, and said the four injured were in critical condition.The police told AFP that "at least four of the involved were British citizens", while local media reported that all of the passengers in the Toyota Land Cruiser were British nationals.The cause of the accident was not immediately known.