Responsibility for safety rests with the rally's organising committee, Superintendent Phil O'Kane said after three people were killed when cars collided with spectators in two different crashes at a motor rally.
"But I do know it is well stewarded, safety is a very big consideration in the planning of it," he said.
More top news
Coal's share of the power mix had fallen to 7%, while wind climbed to new highs to provide 15% of the country's electricity.
State Department spokeswoman Heather Nauert said Pence "was ready to take this opportunity."
Opposition activists said government forces have brought in more reinforcements in recent days.