"As of now, some 50 non-ferrous metals receiving centers have been checked, but no parts stolen from the building's gas supply system have been discovered," said the source.
Over 60 people possibly involved in stealing metal plugs from the basement of a building in Sovetskikh Kosmonavtov Street have been questioned.
There are no specific suspects on this case yet, said the source.
An explosion occurred in building 120, Sovetskikh Kosmonavtov Street in Arkhangelsk on March 16. One of the sectors of the building collapsed. A gas explosion was probably the reason for the tragedy. 48 people died in the explosion.