District superintendent of police Sujeet Kumar said the police raided the embankment following a tip off and busted the camp but the ultras managed to escape.
There was information of the presence of six to eight Maoists staying at the camp and during the raid they escaped taking advantage of the thick grass in the embankment area called diara in local parlance.
Raids are on to apprehend the Maoists, Kumar said.
