Ankara- Two friends of a German tourist who died Thursday night of suspected alcohol poisoning remained in a coma Saturday and were being kept alive by life support machines in an Antalya hospital, a doctor confirmed on Saturday.

"Two are in a coma and four are listed as being in a serious condition," a doctor from Anadolu Private Hospital treating the tourists told the German Press Agency dpa.

The tourists, students at a vocational college in Germany, were on holiday at the Mediterranean resort of Kemer. On Thursday night the group were in a hotel room drinking hard spirits purchased from a local market when they called for help after one of the group fell unconscious.

Ambulance paramedics found Rafael Neca, 21, dead and transported the other tourists to a local hospital.

An official investigation has been launched into the death with authorities checking the quality of the locally-produced liquor. Turkey has a history fake liquors made by illegal home distilleries being sold in markets and restaurants. (dpa)