Three people who were pulled over in Bishan on Monday morning for having tinted car windows were later arrested for traffic-and drug-related offences.
They were in two cars: A 27-year-old man was in the first car with a 24-year-old woman, while a 30-year-old man was in the second car.
It is unclear how the three people are connected.
They were stopped by a Land Transport Authority officer at a bus stop near Block 254, Bishan Street 22, Lianhe Wanbao reported on Monday.
The pair in the first car were reportedly hostile and did not cooperate, and police were called to the scene.
The Straits Times understands that drug paraphernalia was found in both vehicles.
The police said they received a call for help over the case in Marymount Road at 7.56am on Monday.
The 27-year-old man was arrested for traffic-and drug-related offences. The 30-year-old man and the woman were arrested for drug-related offences.
Police investigations are ongoing.