Mexican police detain hundreds of Central American migrants

A Central American migrant traveling in a caravan to the U.S. border rests on the highway near Pijijiapan, Mexico, Monday, April 22, 2019. The outpouring of aid that once greeted migrants as they trekked in caravans through southern Mexico has been drying up, so this group is hungrier, advancing slowly or not at all, and hounded by unhelpful local officials. (AP Photo/Moises Castillo)
Central American migrants traveling in a caravan to the U.S. border walk on the highway to Pijijiapan, Mexico, Monday, April 22, 2019. The outpouring of aid that once greeted Central American migrants as they trekked in caravans through southern Mexico has been drying up, so this group is hungrier, advancing slowly or not at all, and hounded by unhelpful local officials. (AP Photo/Moises Castillo)
Central American migrants traveling in a caravan to the U.S. border walk on the highway to Pijijiapan, Mexico, Monday, April 22, 2019. The outpouring of aid that once greeted migrants as they trekked in caravans through southern Mexico has been drying up, so this group is hungrier, advancing slowly or not at all, and hounded by unhelpful local officials. (AP Photo/Moises Castillo)
Central American migrants traveling in a caravan to the U.S. border walk on the shoulder of a road as they make their way to Pijijiapan, Mexico, Monday, April 22, 2019. The outpouring of aid that once greeted migrants as they trekked in caravans through southern Mexico has been drying up, so this group is hungrier, advancing slowly or not at all, and hounded by unhelpful local officials. (AP Photo/Moises Castillo)
A Central American migrant who is part of a caravan to the U.S. border, pushes a baby carriage as he walks on the highway to Pijijiapan, Mexico, Monday, April 22, 2019. The outpouring of aid that once greeted migrants as they trekked in caravans through southern Mexico has been drying up, so this group is hungrier, advancing slowly or not at all, and hounded by unhelpful local officials. (AP Photo/Moises Castillo)
Central American migrants traveling in a caravan to the U.S. border walk hand in hand on the shoulder of a road in Pijijiapan, Mexico, Monday, April 22, 2019. The outpouring of aid that once greeted Central American migrants as they trekked in caravans through southern Mexico has been drying up, so this group is hungrier, advancing slowly or not at all, and hounded by unhelpful local officials. (AP Photo/Moises Castillo)
Central American migrants traveling in a caravan to the U.S. border walk on a road in Pijijiapan, Mexico, Monday, April 22, 2019. The outpouring of aid that once greeted Central American migrants as they trekked in caravans through southern Mexico has been drying up, so this group is hungrier, advancing slowly or not at all, and hounded by unhelpful local officials. (AP Photo/Moises Castillo)

PIJIJIAPAN, Mexico — Mexican police and immigration agents detained hundreds of Central American migrants Monday in the largest single raid on a migrant caravan since the groups started moving through Mexico last year.