Officers are more likely to be involved in traffic accidents because of their large amount of time spent conducting vehicle patrols, or directing traffic, as well as their work outside their vehicles alongside or on the roadway, or in dangerous pursuits. Officers killed by suspects make up a smaller proportion of deaths. In the U.S. in 2005, 156 line of duty deaths were recorded of which 44% were from assaults on officers, 35% vehicle related (only 3% during vehicular pursuits) and the rest from other causes: heart attacks during arrests/foot pursuits, falling from heights during foot chases, diseases contracted either from suspects' body fluids or, more rarely, from window period emergency blood transfusions received after motor vehicle accidents, shootings, stabbings, accidental gun discharges or falls that result in blood loss.[9]