A Russian city has announced a state of emergency following a mysterious radiation leak.

High radiation levels had been found near a pylon just over a mile away from Khabarovsk, just over the Chinese border, earlier today, according to reports.

Authorities have cordoned off the affected area, but the source of the potentially deadly radioactive leak is unknown and has not yet been made public.

Andrey Kolchin, Khabarovsk's head of civil defence, said: "A source of increased radiation levels was discovered… the area was cordoned.

"It was decided to introduce a state of emergency in Khabarovsk to carry out work faster."

Authorities added the source of radiation had been "removed and placed in a protective container" before being taken to an appropriate waste storage facility.