Minneapolis' police chief is criticizing federal immigration agents after a confrontation with protesters and an attempted arrest of a woman in which an officer kneeled on her back as she lay atop a snow bank and then tried to drag her to a car. Tensions have been rising in the Minneapolis-St. Paul area as federal authorities continue an immigration crackdown focused on the region’s Somali community, the largest in the country. Onlooker video of the confrontation Monday in a Minneapolis neighborhood showed people yelling at Immigration and Customs Enforcement agents to release the woman, claiming she is pregnant and couldn't breathe.