The bus was heading to Cairo from the Red Sea resort of Sharm el-Sheikh when it hit a concrete barrier and overturned.
RTC authorities, who took a serious view of the incident, directed all the depot managers and drivers not to take risks and cross canals and rivulets in light of the floods.
The bus rammed into the truck which was stopped for a tire change on Addanki-Narketpallu highway.
Of the 24 injured passengers, 12 have been admitted to a hospital in Saifai, while the rest were discharged after first aid.
The driver of bus -- which was on its way to Science City -- somehow lost control of the wheels near Pragati Maidan area and rammed into one of the pillars of Maa flyover', an officer stated.
The accident took place at around 5.40 am near Hirnai village on the highway, located about 50 km from the state capital Bhopal
The accident took place near Chhuchhapura village in Sankheda taluka, police said, adding that the car was moving on wrong side of the road.
PM expresses grief over loss of lives in Barabanki accident, announces Rs 2 lakh ex-gratia for victims' kin
The Prime Minister took the stock of the situation as he spoke to Uttar Pradesh Chief Minister Yogi Adityanath.
The double decker bus, en route to Bihar from Haryana, was parked on the side of the road at the time of the accident with passengers inside it.
The crash happened near the town of Slavonski Brod on the highway between the capital, Zagreb, and the Serbian border.
Those killed and injured were travelling in a minibus which was on its from Zira town to Chandigarh carrying supporters of Congress.
The visit is taking place in the backdrop of an incident in which a bus carrying Chinese and local workers fell into a ravine in Pakistan's restive Khyber Pakhtunkhwa province.
The vehicle was moving through a muddy road filled with cracks and potholes when the sudden jerks resulted in the two rear left tyres falling off.
The bus had left the city of Sialkot and was traveling on Taunsa Road and its destination was the city of Dera Ghazi Khan in eastern Punjab province.
Those killed have been identified as Virpal (60), Happy (35), Chhote (40), Rakesh (30), Abhay (18), Vineet (30) and Bhure (25), police said, adding they were returning from a wedding, the SP said.