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 palpatations.

Hong Kong postponed media mogul Jimmy Lai's trial on Friday, awaiting a heart monitoring device -- the second delay this week to the democracy campaigner's case.The Hong Kong government said Wednesday it "strongly disapproved and rejected the slanderous remarks made by external forces" regarding Lai's case.

HONG KONG, August 15 (Reuters) -The closing submissions in a national security trial against Hong Kong pro-democracy businessman Jimmy Lai were delayed on Friday after his lawyer said he had suffered heart palpitations.