Six passengers, including a baby girl, were killed and 50 others injured when a tour bus ploughed into a roadside ditch on Paholyothin  road in Pathum Thani province early Sunday morning.

Police said that the Bangkok-Phanom Prai tour bus was travelling in Klong Luang district of Pathum Thani province toward Bangkok with about 60 passengers on board when it skidded out off the road and plunged into the roadside ditch in the middle of the road and then overturned.

Six passengers on the bus, including a baby girl aged 3-5 months, were killed at the scene while 50 others were injured.

All the dead victims and the injured were later rushed to the hospitals in the province by rescue workers.

Police initially suspected the slippery road might cause the accident, but further investigation is needed to determine the exact cause of the fatal accident.