The Cobra personnel and Jharkhand police had launched the anti-naxal operation at Buda Pahar on the Jharkhand-Chhattisgarh border in Latehar district last evening.
There was information that four ultras, who were injured in a recent encounter with security personnel in Chhattisgarh, were being brought to Latehar through Buda Pahar for treatment, officials said.
Also that top Maoist leader Arvind, who carries a reward of Rs one crore on his head, along with senior LWE leaders Sudhakakran from Andhra Pradesh and others had assembled at Buda Pahar, they said.
The five security personnel, including another Cobra battalion personnel and two police sub-inspectors, injured in the encounter at Buda Pahar and Jaygir Pahari, were airlifted to Ranchi from adjoining Garwah district for treatment, police said.
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The injured security personnel were identified as Assistant Commandants Varunendra Singh and Jitendra Singh, Havildar Subhash Shinde of Cobra 209 batallion and police sub-inspectors Prabhakar Munda and Vinay Kumar of Latehar.
Singh had held a review meeting with senior police and CRPF officials at Ranchi on the Maoist situation.
Security forces had killed six Maoists in an encounter at Karamdih on the foothills of Budha Pahar recently.