(Reason) A series of raids to arrest and deport undocumented immigrants are officially underway across the U.S.with some cities and companies resisting federal enforcement efforts. The crackdown reportedly began on Saturday a day earlier than the Trump administration had announced it would start. New York Mayor Bill de Blasio tweeted that he received reports of enforcement actions in parts of Sunset Park and Harlem but that officers with Immigration and Customs Enforcement (ICE) were unsuccessful after showing up without a warrant. Fox News reports that further ICE raids began late Saturday and are continuing into Sunday morning in jurisdictions across the country. President Donald Trump previously said he would direct ICE to carry out the raids in June but postponed them after some in his circle reportedly demurred. The course of action comes as his administration seeks to quell an influx of migrants from Central America many of whom are showing up at the U.S.-Mexico border with claims of asylum. Leaders in several of the targeted citiesincluding New York Los Angeles and San Franciscoare resisting the efforts. The New York Mayors Office for instance sought to remind migrant families of their rights including that they are not obligated to open the door if approached at home. ICE is not permitted to forcibly enter a residence.