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Nebraska will send state troopers back to North Dakota after a second request from officials there seeking law enforcement help with protests of the Dakota Access pipeline, Nebraska Emergency Management Agency officials said in a news release Thursday.

A team of state troopers were requested through the Emergency Management Assistance Compact, an organization allowing states to lend support to each other in times of emergency, the release said.

Under the compact, the requesting state pays for the assistance.

The release didn't say how many troopers or if any tactical vehicles will be sent to North Dakota, and an agency spokeswoman didn't immediately respond to a request for comment.

The release said NEMA wouldn't release "operational details."

Thirteen Nebraska State Patrol employees, including 11 troopers, returned Tuesday after working with North Dakota law enforcement since Oct. 23. An aircraft also responded.

Opponents argue the $3.8 billion pipeline designed to carry North Dakota oil through South Dakota and Iowa to Illinois could taint drinking water if it leaks into the nearby Missouri River and possibly disturb cultural artifacts including burial sites on the Standing Rock Indian Reservation.