Thai idol girl group BNK48's 19-year-old singer Pichayapa 'Namsai' Natha tearfully apologised onstage during a concert for wearing a t-shirt showing swastika flag of Nazi Germany during a televised rehearsal. Israeli Embassy in Bangkok had expressed "shock and dismay" at the costume on Twitter. "I can't fix the mistake but...promise I won't let it happen again," Namsai wrote on Instagram.