A document para-military forces seized from a Maoist den in Jamui district a few days ago can give Bihar and Jharkhand police sleepless nights.

The document, a copy of which is with The Telegraph, gives clear indications the Maoists are going to step up their activity in Jamui - a Maoist hub on the Bihar-Jharkhand border.

They plan to collect heavy levy from various sections and also procure a chopper. "It is not entirely unheard of. Maoists in Chhattisgarh reportedly have a chopper. More worrisome are details of a decision taken at a meeting for major activities in the region," a senior police officer said.

The region saw Maoists taking on a police force, abducting a few of them and killing two junior police officers in 2010. Railway movement has frequently been disturbed and arms of security forces seized.

The only thing redeeming for the police is that the same meeting decided not to attack railway tracks, except on the "occasion of special operations".

They have also decided not to attack schools and hospitals in future.

The document suggests the Maoists are in touch with a man who can build a two-seater chopper with the help of two Hero Honda engines.

"We can use it in our operations. But some of our loyal comrades will have to learn (how to fly a chopper). We will send two of our men for training," the document said.

The documents hint at the Maoists having access to sophisticated arms and ammunition and even quotes prices at which these can be obtained. They are already in the process of obtaining remote-controlled IEDs.

It also talked of strengthening their presence in North Bihar. The worst hit Maoist districts are Jamui, Gaya and Aurangabad in the south now.

The Maoists are clearly readying to expand their base in Bihar.

The document also talks of Maoists making videographs and photographs of a number of government offices and police stations in Jamui and adjoining Lakhisarai district.

The levy rates being talked about are astounding. The document mentions a monthly levy of Rs 5 crore from the railways and Rs 10 crore a month from the Haldia-Barauni pipeline (see chart).

They are also eyeing levy from electricity plants.

"We think they will demand the amount from officials of public sector undertakings to ensure a safe environment for work," a senior police official said, stressing it was common knowledge government officials pay levy in Maoist areas by giving contracts to persons the Maoists choose.

"The seized document may not be something to be frightened about. But it is an indication we might face more challenging days ahead, as the Maoist teeth themselves with more money, arms and ammunition and more sophisticated techniques to carry out subversive operations," said a police officer.