Pakistan, Feb. 9 -- Brenton Tarrant, the white supremacist who killed 51 worshippers at two Christchurch mosques in 2019, launched an appeal on Monday seeking to overturn his conviction, citing his mental state and detention conditions at the time of his guilty plea.

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Tarrant, an Australian former gym instructor, carried out New Zealand's deadliest modern-day mass shooting on March 15, 2019, targeting two mosques with semi-automatic weapons. His victims included children, women, and the elderly. Prior to the attack, he published an online manifesto and livestreamed the killings for 17 minutes.

Convicted and sentenced in August 2020, Tarrant received life imprisonment ...