SBU Chairman's adviser Markiian Lubkivskyi wrote on Facebook, Censor.NET reports.
"As we have already reported, the Security Service of Ukraine detained four persons who may be involved in preparing and committing terrorist crimes in the city of Kharkiv, including explosion, which killed two and injured eight citizens," he writes.
Explosion killed at least two people at EuroMaidan anniversary peace march in Kharkiv. PHOTOS
"I would like to inform you that a series of terrorist attacks on Feb. 22 was prepared in Kharkiv. In particular, the counterintelligence department in cooperation with the Office of the SBU in the Kharkiv region managed to prevent a terrorist act of the Kharkiv Partizans terrorist organization. Four persons were caught while trying to fire PRO-A Shmel
man-portable rocket launcher at a club where ATO soldiers and volunteers often gather, as well as at one of the city's shopping malls. Other sabotage and terrorist activities were also planned.
SBU prevented terrorist attacks on Kharkiv military enlistment office and a cafe - Lubkivskyi
The withdrawn Smel was produced in Russia. According to the detainees, it was received by the leader of the group in Belgorod (Russia). Due to the explosion and attempts to commit other acts of terrorism, the Security Service of Ukraine announced the highest level of antiterrorism awareness in Kharkiv. Security forces are conducting extern and large-scale counter-terrorism measures in close cooperation," Lubkivskyi writes.