The U.S. Import Price Index increased 2.8 percent in March, the Bureau of Labor Statistics of the U.S. Department of Labor reported, as higher prices for both petroleum and nonpetroleum imports contributed to the advance. The rise followed 0.2 percent and 1.5 percent increases in February and January. Export prices rose 1.5 percent in March, after advancing 1.1 percent and 1.2 percent for the prior two months.