SEOUL, South Korea (AP) — South Korean authorities on Tuesday briefly ordered civilians to evacuate after what they described as a white phosphorus leak at a U.S. military base near the capital, Seoul.

Officials in the city of Pyeongtaek urged nearby residents to move to a safe location and avoid skin exposure after the leak at the Osan Air Base was detected at around 5 p.m. They lifted the evacuation order several hours later, saying decontamination work had been completed, according to text messages sent out by the city.