Over 20 oxygen tanks blew up at a U.S. army base 175 miles southeast of Seoul Thursday, causing a fire. However, there were no reports of casualties.

The incident reportedly took place around 2:30 p.m. local time (1:30 a.m. EDT) inside Camp Caroll. According to the Associated Press, the U.S. military said the cause of the blasts was being investigated.

Shrapnel from the blasts reportedly fell on a nearby farming village, triggering more fires. According to South Korea's Yonhap News Agency, authorities reported 10 separate explosions. Local officials said that 18 fire trucks rushed to the scene, extinguishing the fire.

There are about 28,500 U.S. troops stationed in South Korea to counter potential threats by North Korea, which has been increasing its military capability.

Presumptive Republican presidential nominee Donald Trump has been calling for South Korea to pay more for the upkeep of U.S. troops stationed there. However, according to CNN, defense officials and military experts disagree, saying that Washington could be saving money by stationing troops overseas. Top U.S. commander in South Korea Army General Vincent Brooks said it was "absolutely" cheaper to have American troops overseas than at home.