Law enforcement in Poland is performed by several agencies which are subordinate to the Ministry of Interior and Administration – the State Police (''Policja''), assigned to investigate crimes or transgression; the Municipal City Guard, which maintains public order; and several specialized agencies, such as the Polish Border Guard. Private security firms are also common, although they possess no legal authority to arrest or detain a suspect. Municipal guards are primarily headed by provincial, regional or city councils; individual guards are not permitted to carry firearms unless instructed by their superior commanding officer or commandant.