The United States is looking at building fences along the border with Canada to help keep out terrorists and other criminals, according to a draft report by the U.S. Customs and Border Protection agency

The report proposes the use of “fencing and other barriers” on the 49th parallel to manage “trouble spots where passage of cross-border violators is difficult to control.”

But a spokesperson for U.S Customs and Border Protection said the government is not considering the fence option “at this time” and instead is looking at the environmental effects of putting more manpower, technology and infrastructure along the border.