Seraikela police have arrested one person and launched an investigation into the death of 24-year-old Tabrej Ansari, alias Sonu, who was allegedly lynched by a mob on suspicion of theft and forced to chant Jai Shri Ram and Jai Hanuman. Pappu Mandal, the accused, has been charged with murder, inciting communal hatred and encouraging a mob to attack Ansari.