(Edit: Number of injured people and precise time changed. Lux Express chairman ERR quote added.)
The crash happened at 00:42 a.m. on the Jõhvi - Tartu road in northeastern Estonia.
There were 26 passengers and two drivers in the bus. Altogether 12 people were taken to the hospital from the scene, two with serious injuries. "As of this morning, four remain in the hospital," Hannes Saarpuu, chairman of the board of Lux Express, told ERR.
A police investigation will determine the exact cause and details of the accident but police say the driver was sober and not exceeding the speed limit, reported ERR.
"Sleet made the road conditions difficult," Tarvo Kruup from the East Police Department told ERR, adding that driving on the icy roads was made even harder by strong winds.
According to the initial announcement, the crash happened as the bus drove off the road due to strong winds and a slippery road. The precise conditions of the crash are being investigated.
Lux Express Group is the largest operator of international coach routes in the Baltic region.