A satellite image from August 10, after the explosion, shows the charred remains of at least seven aircraft in the earthen berms.  (Planet Labs)

At least two explosions on Tuesday destroyed at least seven Russian aircrafts at an air base in Russian-annexed Crimea, a new satellite image from Planet Labs shows.

The cause of the explosion is still unknown. The Ukrainian Ministry of Defense says it could not determine the cause, while the Russian Ministry of Defense said the blasts were caused by detonated aviation ammunition but did not reveal how it had been detonated.

A satellite image from Aug. 9 shows several fighter jets sitting inside earthen berm bays in the Saki Air Base. The satellite image from Aug. 10, after the explosion, shows the charred remains of at least seven aircrafts in the earthen berms. 

The fate of the aircraft sitting on the flightline is unclear from the satellite image. Additional aircraft on the flightline and tarmac appear unharmed.

At least four craters are seen in this area of the base. In the area around the earthen berms and flightline, there is a noticeable burn mark and scarred vegetation.

The amount of destroyed planes on Tuesday may wind up making it one of the most destructive days for Russian Air Force aircraft since World War II, including the Soviet-era. The little available data on military aircraft losses during the Soviet era and modern Russia era do not indicate such substantial losses from a single incident, on a single day.  

The explosion killed at least one person, and injured at least nine, according to a statement from the Ministry of Health of Crimea. 

Russia annexed Crimea from Ukraine in 2014 and considers Crimea part of its territory. Kyiv and its allies do not recognize the annexation and consider the peninsula Ukrainian territory under Russian occupation.