Explosions in Moscow were heard overnight as air defences targeted Ukrainian drones.

As a result of the air attack, a fire broke out in the Elma technopark in Zelenograd, 37 miles from Moscow, with one of its buildings damaged.

According to Moscow Mayor Sergey Sobyanin, 33 drones were reportedly shot down.

He said that initially "there were no serious damages or casualties," and that "emergency service specialists are working at the sites where the drone fragments fell".

Elma, according to its website, is home to the production "of electronic equipment, production of control and measuring devices, optical equipment, processing of various materials, scientific research, information technology, production of consumer goods".

Ukraine hasn't yet spoken of the overnight incidents, however, it rarely claims responsibility for attacks outside its internationally recognised borders.