The repeated looting of armoury in Manipur has raised concerns in the security establishment for there is fear that this may lend in the hands of armed miscreants or insurgent groups operating in Northeast India. Manipur police on Thursday stated an unruly mob stormed 2d IRB, Naranseina, Keirenphabi Police Outpost and Thangalawai Police Outpost in Bishnupur District and took away a huge cache of arms and ammunition.