This undated surveillance photo provided by U.S. Customs and Border Protection shows people illegally crossing the United States border from Canada near Derby Line, Vt. Though attention is focused on illegal immigration into the United States from Mexico, officials and documents say there has been a quiet increase in the number of people apprehended entering illegally on the northern border between Quebec and Vermont.

The Mexican border has been getting all the attention when it comes to immigration but there's growing concern over the number of foreigners entering the country illegally across the porous northern border with Canada. This undated surveillance photo provided by U.S. Customs and Border Protection shows a person illegally crossing the United States border from Canada near Derby Line, Vt.