This photo shows a fire breaking out at a U.S. Forces Korea storage facility in the southeastern city of Busan, Thursday. Yonhap

A fire broke out at a U.S. Forces Korea (USFK) warehouse in the southeastern port city of Busan on Thursday, officials said, with no casualties reported so far.

The blaze occurred at 6:31 p.m. at the USFK's facility in Busan, 320 kilometers southeast of Seoul, according to officials.

More than 160 personnel and 51 pieces of fire equipment have been mobilized to put out the fire.

"U.S. Army Garrison Daegu has activated mutual aid agreements with the Busan Fire Dept. in response to a warehouse fire of unknown origin at the Busan Storage Center," the USFK said.

"The warehouse is under renovation and empty, and was not occupied when the fire broke out," it added.

As of 7:55 p.m., Busan fire authorities had raised their response by one notch to Level 2, which mobilizes personnel and equipment from eight to 11 nearby fire stations. (Yonhap)