Authorities were working on the version for a terrorist attack on the case with the Sofia - Kardam train fire that took the lives of nine passengers on February 29, Prosecutor-General Boris Velchev told reporters on March 5.

On his way to the weekly session of the Supreme Judicial Council, Velchev did not say whether he had information about such a terrorist attack.

According to him, the prosecution had two main goals it at the moment - to end the investigation in the shortest of times and if take anyone they believed responsible for it to court.

Velchev said that the investigation could be over within two months. More than 100 witnesses had to be questioned, some more than once, he noted. In addition to the version for terrorist attack, authorities were investigation versions for accident cause and criminal misconduct, Velchev said.

Nine people died in the fire, Bulgaria's deadliest railway accident since 1992, after a fire broke out in a couchette carriage, which had 35 people in it at the time, and then spread to a sleeping coach with 27 people. The Cabinet declared March 5 a day of nationwide mourning.