the country's police now trying to block the caravan from moving toward the u.s. griff jenkins is live in mexico with the latest. griff? >> hey, jon, we are about 1500 miles from the border. we have been with this caravan all day long. let me show you around the square that they have taken over. they are all here, several thousand in this town, just sort of taking over the little basketball court here. you can see also over here a little bit of a community center. a lot of relief groups, mostly smaller church groups and local aid organizations, handing out water and clothes and supplies. but that offer that president nieto made was to give these migrants some temporary work, housing, healthcare, and even some schooling if these migrants would be willing to stop where