It is noted that eyewitnesses heard the explosion at about 3:00 local time (11:00 Moscow time). Law enforcement officers arrived at the scene, as well as specialists in protective suits.
Police cordoned off areas of 3rd Street and Elm Street. Several casualties are reported.
Local residents were asked to lock themselves in their homes and not go out. Businesses and other buildings in the city are closed. Eyewitnesses in Wakefield say the school is closed there as well.
The circumstances and reasons for the incident were not disclosed. An investigation is underway.
A press conference is expected at which details of the incident will be presented.
Earlier, in May, in the American city of Pottstown in the state of Pennsylvania, as a result of an explosion of an apartment building, at least four people were killed and several more were trapped. After the incident, two people were listed as missing.