Serbian army helicopters fly over a ship which is playing the part of being hijacked by alleged terrorists, during a joint Serbian-Bulgarian-Romanian military exercise codenamed Danube Guard 07, in the border zone between the three countries, on the Danube River, near the village of Srbovo, yesterday. The exercise was organised to coordinate the efforts of the three countries in disaster and terrorist threat management. More than 1,600 troops and civilians will take part in the training, with Bulgaria represented by 360 people, Romania by 700 and Serbia by 550.