A 4-year-old boy was killed and his pregnant mother injured by three pit bulls Wednesday afternoon in Delaware, police said.

The boy and his 24-year-old mother were visiting a friend of hers in Kent County when the boy, who had been playing with the dogs, was attacked about 4 p.m., Delaware State Police reported.

The mother was bitten on her arms as she tried to save her son. Two repairmen at the house also tried to stop the attack. The boy was pronounced dead at the scene. The mother was taken to Kent General Hospital to be treated. The dogs were taken by the SPCA. - Robert Moran