The fires were set Wednesday and Thursday to about 25 makeshift tents at a camp of about 2,000 people, most of them from Venezuela, Haiti and Mexico, in Matamoros, Mexico, near Brownsville, Texas.The fires were set Wednesday and Thursday to about 25 makeshift tents at a camp of about 2,000 people, most of them from Venezuela, Haiti and Mexico, in Matamoros, Mexico, near Brownsville, Texas.