A woman working at the National Institutes of Health (NIH) died after she was hit by a vehicle Monday night in the campus' parking lot, the agency says.

Sang-A Park, a visiting post-doctoral fellow from South Korea, died after she was hit in the Bethesda, Maryland, parking lot about 5:30 p.m Monday., an NIH spokesman said in an statement. She was 27.

"We are deeply saddened by this tragic event. A thorough investigation is currently being conducted by the NIH Police," the spokesman said.

The NIH did not immediately release additional information on what happened.

No one else was hurt.

Work is underway on the NIH campus to make walkways safer. More lighted crosswalks and warning signs are planned, an agency website says.

Since 2014, there have been 10 pedestrian accidents and one bike accident on the campus, the NIH spokesman said. None of the other crashes were fatal.

Just off the campus, a 35-year-old NIH employee, Francis G. Plati Jr., died in November 2015 after a motorcycle crash on Rockville Pike.