WASHINGTON, Jan 12 (Reuters) – Housing and Urban Development Inspector General Kenneth M. Donohue and Federal Housing Administration Commissioner David Stevens on Tuesday announced that 15 FHA-approved lenders have been subpoenaed to question why so many of their loans are going into default.

The lenders, including a unit of First Horizon National Corp. are in the sights of the U.S. authorities for questionable underwriting practices on loans backed by the government.

Donohue said the “initiative” was not an investigation and said his office was not yet making any accusations of wrongdoing.

“The goal of this initiative is to determine why there is such a high rate of defaults and claims with these companies and whether there is wrongdoing involved,” Donohue said.

HUD said the probe is focused on corporate offices rather than individual branch offices and could serve as a starting point for more detailed reviews if abuses are uncovered.