mario paz is a the director of the good samaritan resource center. >> it was probably a means of intimidation, basically sending a message that there's a new sheriff in town. >> a source said that u.s. immigration officials are now preparing for a major sweep in the city and in other areas of northern california in which federal officers would look to arrest more than 1,500 undocumented people. abc7 news could not independently verify the chronicle report. regardless. immigrant advocates tell us the story has created fear in their community. >> we're going to have to reach out to our community and say, no, send your children to school, you know, go to work, don't let this -- don't let them win. >> reporter: san francisco supervisors we spoke to are standing together against any attack on their immigration policy. he says he would go to jail again on this issue. >> i think we need people in office who have either been in the back of a squad car or did wh y wagon and i have been both. >>> a detour will last even longer for drivers in the east bay, part of redwood road will remain closed until t