Intelligence organs have warned of an assassination plot against Prime Minister Abhisit Vejjajiva, which is why he had to take cover inside the 11th Infantry Regiment base, PM's Office Minister Satit Wongnongtaey said yesterday.
City police had stepped up their already-strict security measures for the key figures, he said.
Up to six groups known for violence and inciting chaos in the country are being monitored for possible attacks, he said.
Abhisit dodged a question from reporters about the assassination plan, leaving in his armoured vehicle without responding.
