A Singaporean opposition leader, Chee Soon Juan, has again defied a government ban on unauthorised public speaking.

Mr Chee , secretary general of the Singapore Democratic Party, addressed a crowd in the city's business district, calling for greater freedom of speech and transparency in government.

Afterwards, he was ordered to appear at a police station where it's expected that he will be charged again with speaking in public without a licence.

Mr Chee has said he will continue giving public talks until the government gives Singaporeans the right to assemble peacefully and speak freely.