An ammunition depot in Damascus exploded Saturday, state media reported, prompting a blast heard by an AFP journalist in the Syrian capital.

“An ammunition depot for the Syrian army in western Damascus exploded after a fire in nearby fields started spreading,” state news agency SANA said, citing a military source.

The ammunition depot was located in a military zone in Mashrou Dummar, a western suburb, SANA reported.

But in a later statement SANA quoted a military source as saying that “investigations are still underway to determine the cause” of the blast.

The explosion wounded eight pro-government fighters, according to the Britain-based Syrian Observatory for Human Rights.

“It remains unclear if the explosion was deliberate or a result of the fires in the area,” the war monitor said.