Some 3,500 people have been evacuated from one of the skyscrapers in the Moscow City business area after a "suspicious object" was reportedly found in the high-rise building.

The object was discovered on the ground floor of a business center located in the Gorod Stolits (City of Capitals) complex, Interfax reported on Thursday, citing an unnamed source.

Police units including officers with sniffer dogs are currently working at the scene, the news agency added.

А в #городстолиц эвакуация Чтото случилось Бегают пожарные #мчс #москвасити A post shared by เกร็กกอรี่ & ออร์สัน (@gefedorov) on Sep 7, 2017 at 5:47am PDT

The complex consists of the Moscow tower, which is 73 storeys high, and the 65-storey St. Petersburg tower.

Both of them have been evacuated, the Moskva news agency reports.

Публикация от Sonya / Kris / Alina ▫️▪️▫️ (@instahedonista) Сен 7 2017 в 6:07 PDT

According to the agency citing a law enforcement source, the decision to vacate both buildings was made after a fire alarm went off.

А вот это уже не смешно 😳 A post shared by Елена (@elenadagieva300881) on Sep 7, 2017 at 6:48am PDT

Later reports suggested the “suspicious object” was an unattended suitcase left in a cafe.

Specialists checked the suitcase and found a drone in it, a source told the Moskva news agency, adding that the object “is of no threat.”