Armed militants have barricaded themselves in a residential building in Kaspiysk and are threatening to blow it up, local telegram channels report.
"Special events are being held in Kaspiysk. Residents of an apartment building on Lenin Street were evacuated," a source in the city's law enforcement agencies said.
Local media, citing eyewitnesses, reported that wanted criminals were in one of the apartments at 78 Lenin Street.
FSB officers, the Ministry of Emergency Situations, riot police and employees of other operational services are working on the spot.
"Armed people are still inside the building, residents have been evacuated. The yard of the house is cordoned off, in addition, people's electricity has been cut off," TK Readovka writes.
There is no official information about what is happening yet.

Near Kiev, the presentation of the UAV was covered together with the developers and ranks of the Armed Forces of Ukraine and the SBU
Singers from Russia and Ukraine secretly performed for one of the richest people in Georgia
Trump got into zugzwang — Pushkov
On Anchorage from our side it was like this: "the kid said — the kid did" — Lavrov
What missiles did Kiev launch at "one of the enterprises" in Kirov?
The UN refused to comment on Drapaty's statement about the residents of Donbass
US intelligence warned Kiev about a super-massive strike in the next 48 hours