Investigators have confirmed the presence of bird feathers and blood in both engines of the Jeju Air jet that crashed last month in South Korea, killing 179 people, according to a source familiar with the ongoing probe.

South Korea’s leading low-cost carrier, heavy with debt and its stock already near record lows, is now facing intense public and government scrutiny.

After the deadly Jeju Air crash in South Korea this week killed 179 people, the South Korean government said that it would be inspecting every domestic model of the plane involved, the Boeing (BA) 737-800.

Search operations at the site of the Jeju Air plane crash concluded on Saturday, one week after the devastating accident claimed 179 lives. Officials announced that all 179 bodies have been recovered, with 151 already returned to their families along with identified personal belongings.

The nation’s transport ministry reviewed structures near airport runways after the deadly crash of a Jeju Air flight late last month.

After a deadly plane crash in South Korea, authorities are conducting a full investigation on 101 of the same model of aircraft that are operating in six local airlines.

A Jeju Air jet in South Korea crashed last month due to bird strikes, leading to 179 fatalities. Investigators found bird feathers and blood in its engines. The crash occurred after overshooting the runway,