People who may have vandalized rocks in Grand Canyon National Park/NPS Investigative Services Branch

National Park Service authorities are looking for a couple in connection with vandalism in Grand Canyon National Park.

Investigative Services Branch agents and Grand Canyon rangers are seeking information about two people who may have vandalized rocks near the Yavapai Geology Museum.

On May 22, 2016, a visitor at the South Rim of the park observed a couple spray painting graffiti, and was able to capture images of the people and the vandalism, according to a park release. After painting "Evans 16" on a rock feature, the couple left before park rangers could contact them.

If you were in the park that day and may have seen these people, or if you recognize them from the image, you should contact the Investigative Services Branch. You can do so anonymously. You can:

* Call the Tip Line at 888-653-0009

* Send them an online tip

* Email the branch

* Send agents a message on Facebook