By Hyunjoo Jin and Hyunsu Yim SEOUL (Reuters) -South Korean police said on Thursday they had raided Jeju Air and the operator of Muan International Airport as part of their investigation into Sunday's crash that killed 179 people in the worst aviation disaster on the country's soil.

The search warrant lists charges of professional negligence resulting in death after 179 people were killed on a Jeju Air flight.

The death toll was expected to rise further, as the rest of the people aboard the plane remained missing about six hours after the incident.