A Calcutta police vehicle collided with a CTC bus on Red Road around 7.45am on Tuesday, leaving seven cops injured.
The policemen were admitted to SSKM Hospital.
This was the second mishap in 48 hours involving a city police vehicle. On Sunday morning, two men were killed when the motorcycle they were riding rammed into a rapid action force (RAF) bus at the crossing of Queensway and Casuarina Avenue.
A RAF vehicle was involved in Tuesdays accident, too. The van was carrying policemen to be dropped at various points for the morning shift, said Vineet Goyel, the deputy commissioner (headquarters). It was heading towards Lalbazar when it hit the CTC bus.
The vehicles have been impounded and the drivers arrested for reckless driving.
An officer said after a preliminary probe that fog-induced poor visibility might have led to the mishap.
Before the onset of winter, we had alerted all motorists to drive carefully in the morning because of fog. The drivers dont seem to have paid heed to the warning, said an officer.