Protesters march in Salt Lake City in support of the Standing Rock Sioux against the Dakota Access Pipeline. In North Dakota, the state has now run up a $10 million line of credit for law enforcement costs relating to the pipeline.

BISMARCK, N.D. — North Dakota leaders have agreed to borrow an additional $4 million to cover the escalating costs of policing protests at the Dakota Access pipeline and slammed the federal government for not chipping in part of the funding.

The state has now run up a $10 million line of credit for law enforcement costs after an emergency spending panel headed by Gov. Jack Dalrymple voted Tuesday to borrow the additional funds from the state-owned Bank of North Dakota.

Dalrymple said officials have asked for contributions from the federal government, the pipeline company, an American Indian tribe, “and any entity we can think of.” So far, North Dakota and the local governments it backs have shouldered most of the law enforcement expenses — even paying for officers from other states that have assisted North Dakota during the protests.

President Barack Obama says the U.S. Army Corps of Engineers is examining whether the Dakota Access oil pipeline can be rerouted in southern North Dakota to alleviate the concerns of American Indians.

Obama tells the online news outlet NowThis that his administration is monitoring the situation closely but will “let it play out for several more weeks.”

More than 400 people have been arrested since August at the North Dakota portion of the pipeline, which also crosses through South Dakota, Iowa and Illinois.

American Indians and others who oppose the construction of Dallas-based Energy Transfer Partners’ $3.8 billion pipeline have set up an encampment on U.S. Army Corps of Engineers land without a permit; federal officials have said they won’t evict them due to free speech reasons.

Opponents of the pipeline worry about potential effects on drinking water on the Standing Rock Sioux tribe’s reservation and farther downstream on the Missouri River, as well as destruction of cultural artifacts, including burial sites.

House Majority Leader Al Carlson called the lack of federal support “very disturbing” but said the state “will always step up for safety.”

Energy Transfer Partners has not given the state any money for the protest response. However, Emergency Services spokeswoman Cecily Fong said the pipeline developer has provided a security helicopter that has aided law enforcement and has agreed to use it for medivac services if any officers or protesters sustain serious injuries.

Dalrymple issued an emergency declaration in August to cover law enforcement expenses related to protests. The state’s Emergency Commission borrowed $6 million from the Bank of North Dakota in September.

Maj. Gen. Alan Dohrmann, the leader of the state’s National Guard, said about $8 million has been spent to date on law enforcement and other costs related to the protests, centered in south-central North Dakota.

Morton County said it has spent an additional $3 million to cover extra costs.