During the first weeks of the war, the Nigerian government decided to impose a
blockade of Biafra. Access to the secessionist republic through foreign currency transactions, mail and telecommunications, and all seaports and airfields was to be cut off. Initially it was unclear whether the blockade of the coast would be effective with the ships available to the
Nigerian Navy, and whether the
Nigerian Air Force would be able to interdict the air routes. Nevertheless, the blockade was effective and maintained for the next two and a half years. The Nigerian government relied on international law to enforce the blockade, since at the time starvation as a weapon of war was
not prohibited and all neutral countries were obliged to abide by an announced blockade. The Nigerian government threatened reactions against countries that disregarded the blockade and made an agreement with
Cameroon to obstruct Biafra's land border. Some smugglers attempted
blockade running but two ships were destroyed by the Nigerian navy. The blockade interdicted food, medicine, and other supplies needed by civilians. Nigerian federal leaders obstructed the passage of relief supplies and stated that starvation was a deliberate tactic of war, although also dismissing reports of famine as
Biafran propaganda. or more people died as a result of the blockade. Most of the war casualties were civilians particularly children, who were especially vulnerable to malnutrition. Another consequence of the blockade was a rise in violent crime in Biafra. ==International reactions==