Iran's Mehr News Agency reported heavy explosions in Riyadh early Wednesday, alongside a temporary suspension of activity at the Saudi capital's international airport.
Repeated blasts expose risks as Syria works to rebuild its armed forces after years of war.
Blasts were heard in the town of Al-Eis, with local sources attributing them to a Defense Ministry ammunition depot, according to state media.
Residents of the Saudi capital reported two loud explosions and a fire in an Aramco fuel storage tank on the night of Saturday to Sunday.
Police report twin blasts caused property damage in the German city.
Sounds of explosions were heard in the island city, with sources suggesting they originated from the sea.
A report from Mehr News (Iran) sets out the main available details, with claims kept attributed to their sources.
A report from Mehr News (Iran) sets out the main available details, with claims kept attributed to their sources.
A report from Anadolu Agency (Turkey) sets out the main available details, with claims kept attributed to their sources.
A report from Ukrinform (Ukraine) sets out the main available details, with claims kept attributed to their sources.