The Coastal Radar Surveillance System is meant to detect and prevent illegal immigration, smuggling and unauthorised fisheries in mostly western Turkish waters.
Boat carrying migrants reportedly sinks off the coast of the Dikili district of Turkey's western Izmir province.
Authorities say the bus was carrying mostly women and children who were on a trip from Izmir to the resort town of Marmaris.
Turkish town of Selcuk is also one of the most visited tourist destinations in Turkey, due to its close proximity to the ancient city of Ephesus, and House of the Virgin Mary.
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