The attack took place in Nazran, Ingushetia's principal city, and targeted the house of Nazran prosecutor Gerikhan Khabiyev.
Four of the injured were hospitalized, the ministry said, but their conditions were not immediately known.
Ingushetia borders Chechnya, the republic where separatist rebels have been fighting Russian forces for most of the past dozen years, and increasingly has suffered its own wave of violence believed to be inspired by the Chechnya fight, the AP reports.
Two ballistic missiles attacked the US Navy destroyer USS Mason (DDG 87) from the territory of Yemen. The destroyer came to the aid of the hijacked Central Park tanker of Zodiac Maritime