A head of the Security Service is in Tkibuli. According to him, all norms were observed in the shift. Gela Gabinashvili says that an investigation will determine the reason for the incident.

"I can not say anything about the tragedy so far, every norm was preserved. We have all the conditions. This could not be a reason,"- says a head of the Security Service.

A tragic incident, which killed 4 miners and injured six, occurred at Mandela"s shore early morning today.

According to the initial version of the investigation, the methane exploded.