BRATISLAVA (Reuters) - An ambulance helicopter crashed in a park in the Slovak capital of Bratislava on Thursday evening killing a one day old baby in an incubator, a nurse and the pilot, an interior ministry spokesman said. A doctor, the only survivor, is fighting for his life in hospital. There was no official explanation for the crash. The helicopter was transporting the baby, which was born on New Year's Eve, from the town of Dolny Kubin in northern Slovakia to a clinic in Bratislava, the spokesman said.