The blaze at the Al-Hussein hospital in the southern city of Nasiriya was brought under control late on Monday, the BBC reported. 

The cause is unclear, but initial reports suggest it began after an oxygen tank exploded. 

Reporters described charred bodies being carried out of the building. Rescuers are still searching for survivors. 

Health official Haydar al-Zamili told a leading media outlet that there are fears people are still trapped inside the ward, which reportedly has space for 60 patients. 

Protesters demonstrated outside the hospital after the fire, and people posted on social media demanding the resignation of officials. 

Iraq's parliament speaker Mohamed al-Halbousi tweeted that the blaze was "clear proof of the failure to protect Iraqi lives, and it is time to put an end to this catastrophic failure". 

In April, an exploding oxygen tank started a fire that killed at least 82 people at a hospital in the capital Baghdad. Health minister Hassan al-Tamimi resigned after that fire. 

The coronavirus pandemic has severely strained Iraq's health service, already suffering from years of war, neglect and corruption. 

Iraq has recorded 1.4 million infections and reported more than 17,000 deaths from coronavirus, according to Johns Hopkins University data. 

The country has given at least one dose of a vaccine against Covid to just over one million of its roughly 40 million citizens, the World Health Organization says.