SIERRA VISTA, Ariz. (AP) -- Homeland Security and Customs and Border Protection officials are set to discuss their plans for border infrastructure in southern Arizona at an open house Tuesday in Sierra Vista.

They're expected to talk about vehicle and pedestrian fencing, access roads and patrol roads along the Mexican border in the Border Patrol's Tucson sector, which includes Cochise County.

Homeland Security Secretary Michael Chertoff drew strong criticism from environmentalists last year for ordering road and fencing construction within the San Pedro Riparian National Conservation Area.

He waived a number of environmental laws to allow fence construction to proceed under authority that Congress gave him.

CBP says it will build in an environmentally positive way.

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