A massive 27-car pileup has injured at least 51 people and killed at least seven in the county of Somerset in southwestern England. It's not clear how the accident began, but heavy rain and fog led to dangerous driving conditions on the M5 highway. Twenty cars and six trucks were involved in the crash, with several of the cars bursting into flames. "This is the worst road traffic collision anyone can remember,” said Paul Slaven, of Devon and Somerset Fire and Rescue Service.
