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(CBC News) — 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.

The border service is also pondering options including a beefed-up technological presence through increased use of radar, sensors, cameras, drones and vehicle scanners. In addition, it might continue to improve or expand customs facilities at ports of entry.

The agency considered but ruled out the possibility of hiring “significantly more” U.S. Border Patrol agents to increase the rate of inspections, noting staffing has already risen in recent years.

Customs and Border Protection is inviting comment on the options and plans a series of public meetings in Washington and several U.S. border communities next month. It will then decide which ideas to pursue.

U.S. Homeland Security Secretary Janet Napolitano noted last month the challenges of monitoring the vast, sparsely populated northern border region. She stressed manpower, but also a greater reliance on technology.