A total of 12 people have been shot in Philadelphia's Grays Ferry neighborhood, leaving three people dead, police said.

Three people were killed and nine others wounded in a mass shooting early Monday morning in South Philadelphia, police said. The deceased victims were identified only as a 24-year-old man, a 23-year-old man and a 19-year-old man, local CBS affiliate KYW reported.

CCTV footage from outside a home showed dozens of people taking cover as countless gunshots sounded in a Philadelphia neighborhood.