The coronavirus toll in Italy shot past 10,000 on Saturday and showed little sign of slowing despite a 16-day lockdown. Italy now looks certain to extend its economically debilitating — and emotionally stressful — business closures and the ban on public gatherings past their April 3 deadline. Italians had begun to hope that their worst disaster in generations was easing after the increase in daily death rates began to slow on March 22.