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Russia's Federal Security Service (FSB) said Tuesday that a Russian passenger plane that crashed in Egypt's Sinai last month killing all 224 aboard was blown up by a homemade explosive device.

Alexander Bortnikov, the FSB's chief, told Russian state media that "traces of foreign explosives" were found in debris recovered from the crash site.

"FSB and law enforcement agencies of the Russian Federation are taking measures to detect the people involved in the crime," he said, according to the TASS news agency.

Interfax also reported the news. It comes as Russia has stepped up its airstrikes in Syria in support of President Bashar Assad, whose regime is fighting Islamic State militants but also other rebel groups in the region.

Russia's President Vladimir Putin said the "murder of our nationals in Sinai is among the bloodiest crimes" and vowed to find and punish the perpetrators.

"We will look for them everywhere, wherever they are hiding. We will find them in any point of the globe," he said. He asked for international assistance in tracking down and punishing those responsible. Most of the victims were Russian nationals.

The A321 passenger jet operated by Russia's Kogalymavia, also known as Metrojet, was traveling from Egypt's Red Sea resort city of Sharm el-Sheikh to St. Petersburg when it crashed in a remote area of the Sinai peninsula on Oct. 31.

Egypt's government-run MENA news agency denied media reports that workers at Sharm el-Sheikh had been arrested in connection with the plane crash. 

Russia has offered a $50 million reward for information that helps lead to detaining anyone involved in the plot to blow up the plane. The Islamic State, also known as ISIL or ISIS, claimed responsibility and said the attack was in retaliation to Russia's airstrikes in Syria. The claim has not been independently verified.

Families of the 224 people aboard could file lawsuits claiming up to $7 million in compensation for each victim from Egyptian security services and the airport following the bomb confirmation, lawyer Igor Trunov told TASS.

"I was contacted by a major American law firm which is ready to work on this case and represent the interests (of the victims’ families) against the security services and Sharm-el-Sheikh airport," he told the news agency. He added that Russian lawyers are also prepared to assist the families.

http://www.usatoday.com/story/news/world/2015/11/17/russia-egypt-plane-brought-down-bomb/75913192/