In a statement, IJN said Adib was showing “progressive deterioration of his lung function” due to his severe lung injury.

Doctors had decided to reinsert the Veno-Venous ECMO system again at 9pm last night to assist with his breathing.

Adib also requires dialysis support as his renal function has not improved.

“This is a setback. As such, Muhammad Adib is critically ill. In view of Muhammad Adib’s condition, visitations are limited,” the statement read.

Last Sunday, it was reported that Adib was still relying on life support machines to allow his internal organs to heal. It was also reported that he remained in critical, but stable condition.

Doctors had also taken Adib off the life support machine for his heart after it was able to function on its own.

Adib was part of the team of firefighters who rushed to USJ25 following a protest over the relocation of the Sri Maha Mariamman temple which saw rioters setting vehicles on fire.

He was dragged out of the Emergency Medical Rescue Services vehicle and was assaulted.