BISMARCK -- Bismarck Police and the Burleigh County Sheriff's Department worked more than 300 hours of overtime at the Donald Trump event in Bismarck in May .

Police put in a total of 272 overtime hours at a cost of $10,884, said Gloria David, public information officer for the city of Bismarck.

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The sheriff's department had an extra eight people on duty, who worked 76 overtime hours, for a total cost of $2,193, Maj. Kelly Leben said.

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Both agencies are billing the Williston Basin Petroleum Conference for the hours.

To provide enough security for the more than 7,000 people in attendance, 56 Bismarck police officers, 39 highway patrolmen, 19 Burleigh County deputy sheriffs and seven Bureau of Criminal Investigations agents worked the event, Bismarck Police Sgt. Mark Buschena said in May.

To help pay for the cost of extra security, as well as use of the arena, the North Dakota Petroleum Council charged $30 per ticket for the general public wanting to hear Trump speak, spokeswoman Tessa Sandstrom said in May.

Leben said the deputies enjoyed the opportunity to work together with other local law enforcement, even though their feet got sore guarding the doors all day.

Highway Patrol troopers helped on the motorcade and around the Event Center, but did not bill the conference for their time, Cpt. Eric Pederson said.

"That's our job to help agencies do something like this," said Pederson, adding that it was good training for the department.