SINGAPORE - Bus operator SMRT is investigating one of its bus captains after he was caught on camera flashing a rude hand gesture at another driver on the road.

The bus captain has also been taken off duty.

In a statement posted on Facebook on Thursday (Dec 3) morning, SMRT also apologised for the incident and said it was taking a "very serious view about such bad behaviour".

SMRT's response comes in the wake of a Facebook photo shared by lorry delivery driver Alan Yap on Wednesday.

The photo, which shows the bus captain raising his right arm in an offensive gesture, has since been shared more than 4,000 times.

Mr Yap, 39, told The Straits Times that he had been travelling in the middle lane on Lentor Avenue at about 10am on Wednesday when the bus (service number 853) had tried to cut into his lane.

"He signalled and immediately tried to filter, so I had no time to react and did not give way," Mr Yap added.

"Even if he was unhappy that I failed to give way, how can he react in such a vulgar manner when he's wearing the SMRT uniform?"