Acts of sabotage and violence - such as possible car-bombs - are expected this month, the Centre for Resolution of the Emergency Situation warned yesterday.
Constant military and police patrols are being conducted at 26 high-risk locations, while all trash bins will be replaced with transparent ones to minimise the chance of bombs being hidden in them, CRES deputy spokesman Pol Maj-General Piya Uthayo said.
Deputy secretary to the PM, Panitan Wattanayakorn, warned of possible random attacks such as car bombs and killings.
"Indiscriminate bomb attacks will probably be carried out in communities, and it could be difficult to prevent or solve the cases," he said.
The CRES had concluded that the most recent grenade blasts were politically motivated and served as an indicator that more explosions could take place this month.
As well as patrols, ordnance teams would be sent to the 26 high-risk sites, which are mostly political landmarks and key state offices.
Bins near convenience stores, commercial banks, shopping malls and gas stations would be replaced and garbage collected more often.
Deputy Prime Minister Suthep Thaugsuban, citing intelligence tip-offs, said car bombs would possibly be placed in business areas such as Silom and Chinatown this month.
Suthep said he fully supported CRES' plan to distribute CDs with facts about the red-shirt protests even though opposition Pheu Thai Party was against it.
He said it was important to distribute the CDs so facts weren't distorted and that the emergency decree would continue in certain areas.
Suthep declined to comment on ex-PM Chavalit Yongchaiyudh's denial that he was behind two recent blasts. "It will only result in a quarrel," he explained.
Meanwhile, the Department of Special Investigation has taken extra security measures after death threats were made against DSI agents and director-general Tharit Phengdit.