In an advisory, the Home Ministry said CPI (Maoist) would observe January 26 as "black day" and the observance is likely to be marked by hoisting of black flags, desecration of the national flag and other subversive activities in Bihar, Chhattisgarh, Jharkhand, Maharashtra, Andhra Pradesh and Odisha.
Inputs indicate that the outfit may also indulge in acts of violence in these states and there is likelihood of planting of IEDs/booby traps with the naxal banners/flags to target security personnel in Naxal-affected areas, the advisory said.
The Home Ministry asked the states to deploy additional forces in sensitive places, markets, industrial installations, railway tracks, bridges to avoid any untoward incident in the run up to the Republic day, according to sources.