A father chased down and beat to death a thief who stole a car with his children inside, US police have said. Bystanders also joined in the attack on the 54-year-old man, who later died in hospital of head injuries, said detectives in Philadelphia, Pennsylvania. Three young children – aged seven months, 18 months, and five years old – were in the Hyundai when the carjacker stole it on Thursday evening. Their mother had left the car running as she went into a pizza takeaway where her boyfriend – who is the father of the two younger children – was...