Mounties in B.C. are working with police south of the border after an Okanagan couple failed to return from a business trip to Las Vegas.

The children of Penticton residents Albert and Rita Chretien called police to report the couple missing on Thursday; they were supposed to arrive home sometime between Monday and Wednesday.

Police have confirmed that the 59-year-old man and his 56-year-old wife crossed at the border in Oroville on the morning of March 19, but no trace has been seen since.

The Chretiens own a small excavation business and were headed to Nevada to attend a trade show and convention. They never arrived.

"To date, the couple's banking activities and cell phone usage have been nil," RCMP Cpl. Dan Moskaluk said in a release.

The couple was travelling in a light brown 2000 Chevrolet Astro minivan with the B.C. licence plate number 212 CAV.