A day after Maoists killed 17 police personnel in a landmine blast in Orissa, a high alert was sounded in Malkangiri district, the site of the explosion, and borders with Andhra Pradesh and Chhattisgarh were sealed.
State police along with Special Operations Group (SOG) is doing combing operation in the state. They are being assisted by CRPF, anti-naxal Greyhound Force of Andhra Pradesh and Chhattisgarh police, police said.
Amidst speculation about possible use of RDX in Wednesday's blast, experts are trying to ascertain the nature of explosives used by the ultras.
"Our scientific team is working on the spot to verify whether RDX has been used in the explosion," DGP Gopal Chandra Nanda told reporters after visiting the blast site.
Maoists yesterday triggered a landmine blast at MV-126, about 50 km from Malkangiri, when jawans of Orissa's SOG and police were travelling in a van to MPV-41.
The attack came 18 days after the Maoists carried out an attack, which left 35 dead and dozens injured, on a launch carrying Greyhound personnel in a reservoir in Malkangiri district.