Singapore police say they have killed a man and detained two others near a hotel hosting a top-level international security conference.

Defence ministers and leaders from the Asia-Pacific region (including Sri Lanka's State Minister of Defence Ruwan Wijewardena) attended the summit, known as The Shangri-La Dialogue.

Police say they opened fire after a car rammed through police barricades.

The summit ended with China defending its controversial policy of land reclamation in the disputed waters of the South China Sea.

Police say Sunday's shooting is under investigation, but that it appeared to be an isolated incident unrelated to the conference.

Extra security had been in place due to the conference, which was attended by senior defence leaders including US Secretary of Defence Ashton Carter, who spoke at the summit on Saturday.

The incident near the hotel on Sunday began when a car was stopped at a vehicle checkpoint, but then accelerated after the passengers were asked to open the car boot.

Officers opened fire because the car "was endangering the lives of officers", the police statement said.

No weapons were found on the three men, but illegal drugs "and an item believed to be a drug-taking utensil" were found on one of those detained, police said.

The hotel and surrounding roads were briefly placed on lockdown.
(With inputs from BBC)