An unfortunate incident happened in the city of St. Petersburg last Monday when an explosion rocked a metro station killing several civilians and leaving more than 30 people injured. The blast befell near the Tekhnologichesky Institute station on a train arriving from Sennaya Square station.

Intense investigations are still underway, but initial reports said the incident could be connected with terrorism. The blast tore through the traveling train just past 2:30 p.m. (7:40 a.m. ET). According to CNN, the Russian Investigative Committee are working double time to figure out the motives and any related information related to the investigation.

Several witnesses described the incident as "pure horror." Alexey Chirochkin, a witness, told CNN: "People are running, panic (takes over). But there was no crowd. (People) did not jump over each other, did not push each other ... Some were jumping out of (the metro car's) windows. I saw a lot of injured people. People were crawling while bleeding. They had such a look in their eyes. A girl was yelling, 'Please help my guy!'"

What really terrified Chirochkin is the scene inside the train where the blast occurred. "People there did not have whole bodies ... They were not asking for help. They were not moving," he said. "Their eyes were glassy. They were bleeding out. Not a pleasant thing to see."

According to Travel Pulse, Russian President Vladimir Putin was in St. Petersburg when the unfortunate incident happened. His Kremlin spokesman said he is treating the case as of utmost importance and that terrorism is not ruled out.

About four people are still in critical condition, reports say. Adequate assistance is also being given to the families of the victims. Reports also said a second bomb was discovered in another station not far where the blast took place. The bomb was apparently bigger but it was defused safely by experts. No terrorist groups have yet claimed responsibility for the attack.