mireya villarreal road along with ice on one of those operations in southern california. it's 4:00 in the morning and nearly two dozen ice officers are finalizing plans. the agents door knock the homes on their list and identify the illegal imgranted before handcuffing them and loading them into their car. by mid morning six men and women are in custody. one of the people arrested freddie gonzalez served jail time for attempted murder. the immigrants are transferred to a long--term facility for a deportation hearing or deported immediately. >> these are all targeted operations. >> what if someone had been in the house. >> if someone else is in the house our officers have that discretion to conduct a field interview and make that decision if there is going to be an enforcement action. >> immigration advocacy groups say an increase amount of bistanders that weren't on the agency's radar are now getting caught up in these operations. shanan camacho is with chirla. >> ice is doing something very different. we can see that their priorities are changing and that the drag net fo

the number is a reality check that this problem is far from being fixed. >> mireya villarreal, cbs news, los angeles. >> dokoupil: at least 18 people were killed and more than 150 injured when a passenger train derailed in tie want, the train was heading from taipei to another city when it jumped the tracks. the cause of the accident sunday investigation. >> it was a wild and woolly sight today in the streets of madrid. thousands of sheep paraded through the spanish capitol. it is an annual festival where shepherds move their flocks to warmer pastures for the winter using ancient my-- migration routes. up next hot climate science in the world's coldest place. >> dokoupil: warmer ocean and air temperatures have caused ice shelfs in antarctica to thin and collapse at an alarming rate. mark phillips traveled to the bottom of the world flying with nasa's operation ice bridge. >> this is not just a joy ride over some spectacular scenery. >> too low, terrain, too low, terrain. >> this is a low level ariel sortee in a new kind of information war. nasa is here in and arctica gathering ammunitio

mireya villarreal is in arizona. good morning. >> reporter: good morning.e telling us they're seeing larger family units crossing the border here in arizona. some groups as large as three dozen people coming here. some of these groups are actually seeking them out, turning themselves in and then asking for asylum. the centers here in arizona are so overwhelmed, the government is now relying on churches to help house migrants. one pastor told us late last week 800 people were brought to the tucson area in one day. the i.c.e. field office in tucson has seen a 51% increase in family apprehensions compared to this time last year. a migrant mother we spoke to said she decided to cross the border with her son after they ended the separation policy. many of these people have actually been brought to the u.s. by smugglers. border patrol said these smugglers are taking advantage of the change in policy to prey on vulnerable, would-be migrants, coaching many of them on what to say or what to do to gain asylum in the u.s. these families still have to go to federal cou