Bangladesh Nationalist Party (BNP) will observe mourning day on July 12 to pay homage to the victims of the Holey Artisan Bakery Attack in the capital’s Gulshan area.Black flag will be hoisted in the party offices and the party flag will be half-mast. The members will wear a black batch to mourn the death of the victims.It is mentionable that, Gunmen killed 20 people, mostly with sharp weapons, shortly after taking hostage a number of diners at Holey Artisan Bakery in Dhaka’s diplomatic zone on July 1.