The arrests on Thursday, March 30, came after six arrest warrants were issued for three government officials, one migrant, and two contracted security guards.
Three officials from Mexico's immigration agency, two private security guards and the migrant accused of starting the fire, which killed at least 39, face charges of homicide and causing injury.
Mexican President Andres Manuel Lopez Obrador traveled on Friday to Ciudad Juarez, near the U.S.-Mexico border, where 39 migrants died in a fire at a migrant detention center.