Officials evacuated the new Pearl Harbor Visitor Center for about 75 minutes today after someone found a large, unattended duffel bag in one of the museum galleries.

Navy explosives experts checked the rolling duffel and found it contained oxygen bottles used for breathing assistance. It had been left behind by someone helping a Pearl Harbor survivor who uses oxygen, an official said.

The bag was discovered in the museum’s Road to War gallery at 10:55 a.m. The owner was identified and the museum was reopened after an hour and 15 minutes.