Syrian state television has quoted a military official saying the plane shot down by Turkey was pursuing rebel fighters within Syria's own territory.
The Turkish Prime Minister has said the jet was shot down because it had violated Turkish air space.
More top news
Tackling the effects of the emerging drug has been described as one of the 'biggest challenges in policing' for 30 years.
A 16-year-old boy has been arrested on suspicion of terror offences as he prepared to leave the UK.
An man is reported to have wounded at least five people - two seriously - in an attack in the Swiss town of Schaffhausen.