The security forces personnel comprising - CRPF and district armed police - were on their routine long-range patrolling in extremist-hit area of the district when the ultras opened fire on them yesterday, the police said.
Around 30 to 35 rounds were fired by the security forces in retaliation, forcing the PLFI ultras to make a hasty retreat, Superintendent of Police, Anish Gupta said.
Some mobile phones and sim cards were recovered from the spot, the police said.