"At approximately 19:10 Moscow time [15:10 GMT] officers at a police post in Nazran mistakenly fired shots from assault weapons at a car carrying guards from President [Yunus-Bek] Yevkurov's personal security unit. A shootout occurred," Kaloy Akhilgov said.
The vehicle was not traveling as part of a presidential motorcade.
Two Interior Ministry officers and one presidential guard were killed in the shootout. One presidential security officer was hospitalized.