Bangkok Governor Sukhumbhand Paribatra has instructed municipal police to tighten security at government compounds and landmarks in Bangkok, and Prime Minister Yingluck Shinawatra said she was concerned and had assigned her deputy Chalerm Yoobamrung to take charge.

But the National Police chief and national security agencies said the imposition of the Internal Security Act (ISA) to cope with possible violence was not necessary and there was nothing to worry about.

Read more: The Nation