Iran's largest navy ship caught fire after a mysterious blast in the "engine room" and burned for 20 hours in the Gulf of Oman before sinking.
The blaze broke out onboard the British-built Kharg during a training mission at around 2.25am today.
It's reported the vessel sank near the port of Jask on the Gulf of Oman.
"All efforts to save the vessel were unsuccessful and it sank," Iran's Fars news agency reported.
The entire crew managed to evacuate the ship and pictures shared on Iranian social media showed images of sailors wearing life jackets as they fled the vessel.
The ship was on fire for 20 hours as military officials battled to extinguish the flames before it finally went down.
Tehran-based defence and security expert Hossein Dalirian said "speculations about attacks on the ship are not true".
"This happened due to a technical defect in the engine room," he tweeted.
Oh dear, what a pity, never mind. At least the crew got off.
A massive blaze broke out at an oil refinery in Iran just hours after the country's largest warship caught fire and sank in the Gulf of Oman.
The latest mystery disaster came the same day the warship caught fire after a blast in the "engine room" and burned for 20 hours in the Gulf of Oman before sinking.
Officials said the fire at the Tondgooyan Petrochemical Co. to the south of Tehran was an accident, blaming a leak in a liquefied gas line which led to a huge explosion.
The blaze broke out at the state-owned facility on Wednesday night, the Oil Ministry's SHANA news agency said, sending plumes of black smoke into the sky over the capital.
The oil refinery continued to burn into a second day on Thursday as firefighters struggled to extinguish the flames.
Coincidence or maybe a cyber attack sequence.
It will be interesting to what other "accidents" happen over the next few weeks.