For example, after the 2006 Israel-Lebanon conflict, UN experts have estimated that as many as one million unexploded bomblets may contaminate the hundreds of cluster munition strike sites in Lebanon. In addition, some cluster bomblets, such as the BLU-97/B used in the CBU-87, are brightly colored to increase their visibility and warn off civilians. However, the yellow color, coupled with their small and nonthreatening appearance, is attractive to young children who wrongly believe them to be toys. This problem was exacerbated in the War in Afghanistan (2001–present), when US forces dropped humanitarian rations from airplanes with similar yellow-colored packaging as the BLU-97/B, yellow being the NATO standard colour for high explosive filler in air weapons. The rations packaging was later changed first to blue and then to clear in the hope of avoiding such hazardous confusion. The US military is developing new cluster bombs that it claims could have a much lower (less than 1%) dud rate. Sensor-fused weapons that contain a limited number of submunitions that are capable of autonomously engaging armored targets may provide a viable, if costly, alternative to cluster munitions that will allow multiple target engagement with one shell or bomb while avoiding the civilian deaths and injuries consistently documented from the use of cluster munitions. Certain such weapons may be allowed under the recently adopted Convention on Cluster Munitions, provided they do not have the indiscriminate area effects or pose the unexploded ordnance risks of cluster munitions. In the 1980s the Spanish firm Esperanza y Cia developed a 120mm caliber mortar bomb which contained 21 anti-armor submunitions. What made the 120mm "Espin" unique was the electrical impact fusing system which totally eliminated dangerous duds. The system operates on a capacitor in each submunition which is charged by a wind generator in the nose of the projectile after being fired. If for what ever reason the electrical fuse fails to function on impact, approximately 5 minutes later the capacitor bleeds out, therefore neutralizing the submunition's electronic fuse system. Later a similar mortar round was offered in the 81mm caliber and equipped some Spanish Marine units. On signing the Wellington Declaration on Cluster Munitions, Spain withdrew both the 81mm and 120mm "Espin" rounds from its military units. Countries and disputed territories (listed in italic) that have been affected by cluster munitions as of August 2019 include: As of August 2019, it is unclear, whether Colombia and Georgia are contaminated. Albania, the Republic of the Congo, Grenada, Guinea-Bissau, Mauritania, Mozambique, Norway, Zambia, Uganda, and Thailand completed clearance of areas contaminated by cluster munition remnants in previous years.