(FILES) This file handout illustration image obtained on February 3, 2020, courtesy of the Centers for Disease Control and Prevention, reveals ultrastructural morphology exhibited by the novel coronavirus, COVID-19 Lizabeth MENZIES / Centers for Disease Control and Prevention / AFP.

A 13-year-old British boy has died days after testing positive for COVID-19, hospital officials and his family said on Tuesday, with relatives saying he had no underlying illnesses.

The boy, who died Monday, is believed to be Britain’s youngest confirmed death in the coronavirus pandemic. A 12-year-old girl, whose death was confirmed earlier on Tuesday in Belgium, is thought to be Europe’s youngest victim.

A spokesman for King’s College Hospital NHS Foundation Trust said, “Sadly, a 13-year old boy who tested positive for COVID-19 has passed away, and our thoughts and condolences are with the family at this time.

“The death has been referred to the coroner and no further comment will be made.”