A thriving black market existed in the centre of the city as banks experienced shortages of local currency for exchange. At night, the city of Mogadishu lay in darkness. Close monitoring of all visiting foreigners was in effect. Harsh exchange control regulations were introduced to prevent export of foreign currency. Although no travel restrictions were placed on foreigners, photographing many locations was banned. During daytime in Mogadishu, the appearance of any government military force was extremely rare. Alleged late-night operations by government authorities, however, included "disappearances" of individuals from their homes.