South Korea released a preliminary report into last month’s deadly Jeju Air Co. crash that offers more detail on the role of bird strikes in the disaster, while still leaving crucial questions unanswered.

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.

Bird detection radars to be installed at all South Korea airports after Jeju Air crash - Thermal imaging cameras and detection radars will be fitted following the deadly incident in December

STORY: South Korea has released the initial findings of a probe into the crash of a Jeju Air flight last month. But mysteries remain. All 175 passengers and four of six crew were killed in the incident,

Authorities have suggested that migratory bird strikes were the cause of last month's deadly plane crash in South Korea, according to multiple reports.

Pilots’ actions after that strike are an early focus of the investigation, according to people familiar with the probe.

Bird feathers and bloodstains were found in both engines of the Jeju Air plane that crashed in December, according to a preliminary investigation released on Monday. The Boeing 737-800 was flying from Thailand to Muan in South Korea on December 29 when it crash-landed and exploded into a fireball after slamming into a concrete barrier.

South Korean authorities said Thursday all airports across the country will be ordered to install bird detection cameras and radars after the Jeju Air crash that left 179 people dead.