COVENTRY, Vt. — The FBI is working with the Vermont State Police and the Essex Police Department to search a Coventry landfill as part of an ongoing investigation into the disappearance of a husband and wife from Essex who have been missing almost a year.

The office of Vermont’s top federal prosecutor says the search of the landfill owned by Casella Waste Management is a followup to a search last month of a location on Vermont Route 15 in Essex.

Fifty-year-old William Currier worked at the University of Vermont and his 56-year-old wife worked for Fletcher Allen Health Care. They were last seen June 8, 2011. Police suspect foul play was involved in their disappearance.

The Coventry search is expected to last from one to three weeks.