Two firefighters were killed Sunday after being trapped in a pavilion in the city of Gangneung on South Korea's east coast that collapsed following a blaze, firefighting authorities said.

The two were extinguishing the fire at Seoknan Pavilion, one of the scenic spots around the city's Gyeongpo Lake, before the pavilion collapsed around 4:29 a.m. They were pronounced dead after being rushed to hospitals.

This photo, taken on Sept. 17, 2017, shows the rubble of Seoknan Pavilion in the city of Gangneung on South Korea's east coast after it collapsed following a fire. (Yonhap)
This photo, taken on Sept. 17, 2017, shows the rubble of Seoknan Pavilion in the city of Gangneung on South Korea's east coast after it collapsed following a fire. (Yonhap)

About 10 minutes after the building collapsed, the firefighters, a 59-year-old and 27-year-old both identified only by their last name Lee, were rescued but were in cardiac arrest.

The fire at the pavilion started around 3:51 a.m. after a fire had been extinguished at the structure the previous day, firefighters said. Built in 1956, the 10-meter-high wooden pavilion has a floor space of 40 square meters.

Police and firefighting authorities are investigating what caused the accident. (Yonhap)