Singapore police enhanced security measures after they shot and killed one person and arrested two others early on Sunday near the Shangri-La Hotel which is hosting a three-day security conference.
Police asked the driver to open the trunk of the car at a vehicle checkpoint but he accelerated suddenly and crashed through barricades despite warnings to stop. Police then opened fire on the vehicle and kill one of the occupants.
"Due to the ongoing Shangri-La Dialogue, security measures including vehicle and person checkpoints have been put in place in the vicinity of the Shangri-La Hotel,"Singapore police said in a statement on Sunday.
"Substances believed to be drugs were found on one of the persons detained," the police added.
US Defense Secretary Ash Carter and other top officials who travelled to take part in the meeting were in the hotel when the incident occurred at the security checkpoint.
The US officers who accompanied Carter said they weren't aware of the incident until hearing it on the news. Carter and his delegation left after the incident for Vietnam.
Officers said the situation in the area is under control and roads were reopened.
The Shangri-La Dialogue meeting resumed by 9 a.m. local time thanks to the measures that were taken by the security officers.
Singapore is one of the safest countries in the world with its low crime rates, according to the Economist’s Safe Index 2015.
The only major crime troubling the country is drug trafficking, which the country is battling with tough anti-drug laws and capital punishments.