Most of the victims were members of a family who had come to the morgue in San Pedro Sula to retrieve the body of a man gunned down the day before, they said.
In the grip of soaring gang and drug violence, Honduras has the world's highest murder rate -- 79 per 100,000 inhabitants, according to monitors at the National University.
San Pedro Sula coroner Hector Hernandez said the gunmen pulled up in two vehicles and opened fire on a group of people waiting outside to take possession of the body of Jose Luis Terrero.