A handful of migrants from the caravan that arrived at the U.S.-Mexico border have begun a hunger strike over a decision by Mexican police to alleviate overcrowding.

“What the police are doing is unfair," said migrant Gerson Madrid. "The truth is we are fighting for our rights."

Mexican law enforcement officials have begun transporting migrants from the encampment in Tijuana to a new shelter.

Madrid, a 22-year-old from Honduras, told Reuters that he and a few others will begin a hunger strike to protest the treatment from the police.

“Why are (the police) treating us like this if we’re not causing them or the Mexican people any trouble?” he asked.

Mexican police blocked the migrants after rain poured down on the encampment and drenched much of the migrants' possessions. They wanted to go to the El Chaparral border crossing.

Reuters reported that city officials told them the rain and cold temperatures had caused disease to spread among the migrants, including flu-like sicknesses, lice and chicken pox.

On Sunday, some migrants attempted to rush through a weakness in the border fence, precipitating a response from law enforcement that included the use of tear gas.

Some migrants have responded to the resistance at the border from U.S. officials by returning to their home countries.

Here's the latest from the migrant camp: