The plane was downed by the Turkish military according to the rules of engagement because it violated Turkish airspace, the Turkish official said.
A Turkish military statement said that the plane violated Turkish air space in the Hatay province and was warned 'ten times in five minutes'. "Our two F-16 planes on air patrol duty intervened in the plane in question on November 24, 2015, 9:24am, according to the rules of engagement," the statement said.
The Russian defence ministry said that an SU-24 fighter jet crashed in Syria as a result of an attack from the ground. "A probe is in progress into the circumstances of the Russian plane crash," the ministry was quoted as saying by the TASS Russian News Agency, adding that the plane had stayed within Syrian airspace. Objective monitoring data confirm this.".