At the peak of the crackdown, carloads of masked immigration officers were a common sight in the streets of Minneapolis, while thousands of people were being arrested every week in Texas, Florida and California. In December alone, arrests by Immigration and Customs Enforcement agents peaked at nearly 40,000 nationwide, according to data provided to UC Berkeley’s Deportation Data Project and analyzed by The Associated Press. Arrests were nearly as high the next month. But the killings by federal agents of two U.S. citizens in Minneapolis and the subsequent shake-up of top immigration officials were quickly followed by a nearly 12% drop in arrests since early February.