Seoul, South Korea CNN — South Korean fighter jets accidentally bombed homes during a live-fire drill with US forces, injuring more than two dozen people on Thursday, Seoul’s military said.

Eight MK-82 general-purpose bombs were “abnormally dropped” from two KF-16 fighter jets and landed outside the designated firing range at approximately 10:07 a.m. local time, hitting civilian infrastructure in Pocheon city, northeast of the capital Seoul, according to the South Korean Air Force.

South Korea’s defense ministry said initial findings indicated the accident was caused by a pilot inputting incorrect bombing coordinates.