Severe deficiencies in Edgartown’s wastewater department annual audit have prompted a fraud investigation by the Massachusetts’ district attorney office and state police.

A sophisticated phone fraud scheme which targeted large numbers of Vineyard residents last week, seeking access to their bank details, appears to have fooled very few people and netted little for the perpetrators, Island banks reported this week.

The phone calls, which began on Thursday night, purported to be from local banks, informing customers their bank cards had been suspended. The computer-generated voice on the line asked them to press one to be transferred to the security department, so the card could be re-activated.