Rescue teams of the emergency service, as well as special teams of the Croatian Interior and Defence Ministries aboard helicopters flew many times during the day over the terrain covering a wider area of Plitivice Lakes, where the missing plane is believed to have crashed, but they could not spot the missing aircraft.
Thick forests with very high trees as well as suspicions that land mines are planted on the ground have rendered the search more difficult.
The spokesman for the Interior Ministry, Zlatko Mehun, said this evening that the helicopters of the two ministries would try to detect the plane using termovision methods during the night. This, however, depends on weather conditions, he stressed.
The border service of Bosnia-Herzegovina also joined in the search today, as the 'suspicious' area is near the Croatian-Bosnian frontier.
The missing plane was one in a group of a total of eight sports planes which departed from Budapest towards the Croatian island of Brac on Friday for a weekend. Passengers on the small sports planes were Hungarian businessmen and members of their families.
Dense fog and unfavourable weather conditions obstructed their safe flight. One of those planes crashed at the Plitivice Lakes area last night killing two people on board. Another five planes landed safely at the Zemunik Airport near the coastal city of Zadar, and one plane had to make an emergency landing in Drnis in the Sibenik hinterland.