MOSCOW - Russia promised Tuesday to take prompt measures to find and punish all people involved in the Oct. 31 Russian plane crash over Egypt's Sinai Peninsula, which was earlier confirmed by the Russian Federal Security Service (FSB) to have been caused by a terrorist attack.

"We can definitely say that this is a terrorist act," FSB chief Alexander Bortnikov told Russian President Vladimir Putin during a meeting held late Monday evening on the outcome of the plane crash investigation.

"According to our experts, a self-made explosive device equivalent up to 1 kg of TNT was set off on board, which explains why the fragments of the aircraft were scattered over a large area," an online transcript published by the Kremlin on Tuesday quoted Bortnikov as saying.

Bortnikov added that the investigation of aircraft debris, passengers' personal belongings and baggage revealed traces of an explosive.

Putin has ordered all Russian security services to find and punish the terrorists that were involved in the plane crash.

"We must be doing this without any limitations, to know each of the terrorists by name. We will be searching for them everywhere, no matter where they hide. We will find them in any place of the world and they will be punished," Putin said.

He added that Russia would also appeal to partners, namely people who share the moral and ethical values that underlie Russian policies of foreign affairs, security and anti-terrorism, to find and punish the terrorists.(Xinhua)