The walkout, which started on Tuesday, has prompted major hospitals to postpone procedures and turn away patients seeking emergency care and fanned fears of wider disruption in the country's medical system if the dispute is drawn out.

Nearly 9,300 of the country's 13,000 interns and resident doctors at 100 large hospitals nationwide have tendered resignations so far, and more than 8,000 had left their workplace as of 10 p.m. on Wednesday (1300 GMT), vice health minister Park Min-soo told a briefing.

(Reporting by Hyonhee Shin; Editing by Ed Davies)