ANKARA, March 30 (Reuters) - A ballistic missile launched from Iran entered Turkish airspace before being shot down by NATO air and missile defences deployed in the eastern Mediterranean, Turkey's defence ministry said on Monday.
The incident marked the fourth such incident since the start of the U.S.-Iraeli war with Iran, following three earlier interceptions by NATO systems earlier this month that prompted Ankara to protest and warn Tehran.
Tehran has denied in the previous three incidents that it authorised such launches and has asked Ankara to form a joint investigation into the matter.
The ministry said all necessary measures were being taken "decisively and without hesitation" against any threat directed at Turkey's territory and airspace.
(Reporting by Ece Toksabay and Tuvan Gumrukcu; Editing by Jonathan Spicer )