The directive comes as investigators focus on bird strike as one of the causes for December's deadly plane crash.

South Korean authorities said Thursday that all airports in the country would be required to deploy thermal imaging cameras and bird detection radar systems in the wake of the Jeju Air crash that left 179 dead.

The exact cause of the Jeju Air crash remains unclear, and the investigation is complicated because the black boxes stopped recording four minutes before impact.

All South Korean airports will install thermal imaging cameras and bird detection radar systems, according to reports from several Korean media outlets. This decision follows a preliminary report by the by the Ministry of Land,