Nagasaki Prefectural Police have eased security near the U.S. naval base in Sasebo, Nagasaki Prefecture, police officials said Wednesday.
Security measures in the area had been boosted in the wake of the terrorist attacks in New York and Washington.
Officers had set up a special unit and mobilized riot squads, putting them on 24-hour duty near the base after Sept 11.
A police official said the drawdown was made Monday because "circumstances have changed from the tense situation after the attacks."
Although the number of security personnel in the area has not been scaled back, police will carry out more flexible patrols in front of the gate.
"We will continue to patrol around the base," the official added.