clearly, this has the hallmarks of a vicious premeditated terrorist attack. the blast went off between hey market and technological institute stations in central st. petersburg. the door of the train was blown right off the carriage door. the conductor made the split second decision to keep driving after the blast to the next station. people are praising that decision after the fact because it made the evacuation of the wounded that much easier. the st. petersburg subway system is extremely deep. st. petersburg is a city of canals. also this system was used as a bomb shelter during world war ii. as i mentioned earlier, another unexploded homemade bomb was found at another subway station at revolution square about an hour after the explosion occurred. it contained, melissa, two pounds of explosives. so if it had gone off, it would have had five times the impact