A man walks beside a crashed bus on a highway near capital Sofia, Bulgaria, April 13, 2018. REUTERS/Stoyan Nenov

SOFIA (Reuters) - Six people were killed and at least 20 others including a child were injured when a bus overturned on a highway near the Bulgarian capital, the health ministry said on Friday.

Ambulances ferried 19 people to Sofia hospitals and two were in critical condition after the crash some 28 km (17 miles) east of Sofia, national radio reported. The accident was caused when a car crashed into the bus, the bus owner told the radio.