A court in Hong Kong adjourned a national security trial hearing of media mogul Jimmy Lai on Friday due to concerns about his health after his defense said he had been experiencing heart palpitations.

Lai, 77, has pleaded not guilty to charges under Hong Kong's national security law of conspiracy to collude with foreign forces, as well as to a separate charge of conspiracy to publish seditious material. He has been held in solitary confinement for more than 1,500 days since December 2020.