A bus carrying 40 passengers on Thursday slid off a highway in the Moscow region and flipped onto its side before colliding with a tree, the region's emergencies department said.
Although pictures of the bus show what appears to be a serious crash, only four people were injured, an unidentified law enforcement official told RIA Novosti. All four have declined hospital treatment, he added.
Poor driving conditions caused by snow have been blamed for the crash, which took place at 9:15 a.m. on a section of the Mozhaisk Highway about 100 kilometers southeast of Moscow.
Traffic has not been affected by the crash, the department said.