A measure of Americans who signed contracts to buy homes fell in February.

The National Association of Realtors says its seasonally adjusted index for pending home sales fell to 104.8 in February. That's down from 105.2 in January, which was the highest reading since April 2010, when a homebuyer's tax credit was boosting sales.

There is generally a one- to two-month lag between a signed contract and a completed sale.