New York City officials have formed a special task force to determine the cause of a rising number of fatal construction accidents in the city. The spate includes 29 jobsite fatalities in the 12 months ended September 2006, up from 17 deaths during the previous period, according to the city’s Buildings Dept. The task force will issue findings later this year, but initial investigations show 19 of the workers killed last year worked for contractors with 10 or fewer employees, 21 had limited English proficiency, and 24 were nonunionized workers, according to a task force spokesman. In the last month, the need for the task force was underscored by three more worker’s deaths, including a laborer in an equipment accident on a demolition job, a laborer in a roof collapse and an ironworker who was crushed while hoisting a steel plate.