An accident involving 2 cars and a bus in the 4100 block of Nebraska Avenue NW in D.C. has injured several people. D.C. firefighters tweeted that 18 children were on the bus at the time. One person was ejected, according to the tweet. Two children and a driver are being transported to the hospital, according to fire officials. A crew at the scene says the bus was up on the grass by the National Presbyterian Center.