The health of dissident journalist Roman Protasevich, a frequent critic of Belarusian President Alexander Lukashenko who was jailed following Sunday’s diversion of a plane bound for Lithuania, remains in question with conflicting accounts of the 26-year-old’s physical state.

“According to his mother, Roman Protasevich is in hospital in critical condition – heart disease,” Tadeusz Giczan, Protasevich’s editor-in-chief, tweeted on Monday.