updated 1/29/2011 7:26:46 PM ET 2011-01-30T00:26:46

The suicide bomber who killed 35 people at Moscow's busiest airport was deliberately targeting foreigners, investigators say, which would mark an ominous new tactic by separatist militants in southern Russia if he was recruited by an Islamist terror cell.

Federal investigators said Saturday they know the identity of the bomber, a 20-year-old native of the volatile Caucausus region, where Islamist insurgents have been battling for years for a breakaway state.

But the country's top investigative body stopped short of naming him, fearing that it would compromise ongoing attempts to identify and arrest the masterminds of the Domodedovo Airport attack on Jan. 24. The blast also wounded 180 people.

There has been no claim of responsibility, but security analysts suspect Islamist separatists of organizing the bombing because of its magnitude and method.

"It was no accident that the terrorist act was carried out in the international arrivals hall," federal investigators said in a statement. "The terrorist act was aimed first and foremost at foreign citizens."

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The victims were mainly Russians, but also included one person each from Britain, Germany, Austria, Ukraine, Tajikistan, Kyrgyzstan and Uzbekistan.

The violence stemming from the predominantly Muslim Caucasus region originates from two bloody separatist wars in Chechnya in the past 15 years. Federal forces wiped out the large-scale resistance, driving the insurgency into the mountains and into neighboring provinces. The rebels seek an independent Caucasus emirate that adheres to Shariah law.

Caucasus rebels have claimed responsibility for a number of deadly attacks over the years, including a double suicide bombing on the capital's subway system in March 2010 that killed 40 people. One of the subway stations hit was under the Federal Security Service headquarters in downtown Moscow. The service, the main successor to the feared Soviet KGB, is known by its Russian language acronym, the FSB.

This time, the terrorists are out to show that it's not just the Russian public who are defenseless, said Pavel Felgenhauer, an independent security analyst.

"There is always a message," he said. "If the message with the metro bombings was to show the FSB that they are not out of reach, then the message here is that foreigners should keep away from Russia, it's a dangerous place. The point was to scare off foreigners, not to maybe kill them but to hit Russia's image, (and) its economy as an investment destination."

"Looking at Medvedev's reaction, it seems that point got through," Felgenhauer said, referring to President Dmitry Medvedev, who postponed his trip to the World Economic Forum in Davos because of the blast. When he eventually arrived on Wednesday, Medvedev condemned the perpetrators and sternly defended Russia as an investment haven.

Rebels in the Caucausus mount regular attacks on police and security forces in the region, according to police reports. Human rights activists say their violence is provoked by a savage crackdown on peaceful civilians by authorities in the region, and hold Chechen President Ramzan Kadyrov and his feared private army to blame. Kadyrov, a former rebel himself until he switched sides and was subsequently installed by the Kremlin as president, denies being behind disappearances, torture and extra-judicial killings that rights activists say plague the region.

The Caucasus hosts at least 100 ethnicities including Chechens, who resisted czarist conquest of the region for hundreds of years.

Since the blast at Domodedovo Airport, a half-dozen transport and police officials have been fired. Medvedev said after the blast that Domodedovo's security was in a "state of anarchy."

Russia's parliament has given preliminary approval to a law creating color-coded terrorist threat alerts, a measure rushed forward in the wake of the airport bombing. The proposed law is modeled on the U.S. system instituted after the Sept. 11 attacks, which Washington announced Thursday it would be abandoning by the end of April and replaced with a new plan to notify specific people about specific threats. Critics had complained the general color alerts were unhelpful. Russia's State Duma, or lower house, unanimously approved the bill Friday in the first of three required readings.

The explosion also called into question Russia's ability to safely host major international events such as the 2014 Winter Olympics and the 2018 World Cup, events designed to attract foreigners and their investment capital, to Russia.

Copyright 2011 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

Video: Moscow suicide bomber: 'I'll kill you all'

  1. Transcript of: Moscow suicide bomber: 'I'll kill you all'

    BRIAN WILLIAMS, anchor: Overseas tonight more than 30 people are dead, more than 150 injured after a massive suicide bombing attack in one of the busiest airports in all of Europe , in Moscow . Officials say a male suicide bomber walked into the international arrivals terminal and set off an enormous explosion. And the pictures out of there tonight are tough to watch. Our chief foreign correspondent Andrea Mitchell has more on the attack and who may be responsible.

    ANDREA MITCHELL reporting: The crowded baggage area looked like a battlefield amidst a gruesome mix of shrapnel, blood and body parts, the injured on gurneys, after at least one suicide bomber set off the bomb with the equivalent of 15 pounds of TNT . Security was light. An eyewitnesses saw a man walk in with a suitcase and shout, 'I'll kill you all.'

    Mr. ARTYOM ZHILINKOV (Eyewitness): I just raised my head and here came the blast. There were many cries and somebody made a shout, starting with the sound "Ah," and this was followed by the explosion. I saw the suitcase, the suitcase was on fire.

    Unidentified Man: Terrible. I never wish I'd seen it.

    Unidentified Reporter: Are you frightened now?

    Man: No, but I'm very shocked.

    MITCHELL: Officials quickly cordoned off the scene reports NBC 's Yonatan Pomrenze from the terminal.

    YONATAN POMRENZE reporting: Just hours after this horrific attack here, the airport is functioning and back on its feet, but it will take longer to heal the personal pain and restore Russian stability, shaken hard by this attack on Moscow 's busiest airport .

    MITCHELL: Russia 's President Dmitry Medvedev went on television to offer reassurance.

    President DMITRY MEDVEDEV: We can take all steps in conducting this investigation so that we get information fast so that we can pursue the investigation, so to speak, while the trail is still warm.

    MITCHELL: And on Twitter , Medvedev promised, "Security will be tightened at all of Russia 's airports and major transport hubs." Terrorism experts immediately suspected rebels from the Russian province of Chechnya , believed responsible for a trail of other attacks, including the bombing of Moscow 's subway last March, attacks on two express trains in November of 2009 , and in 2004 the suicide bombings of two passenger planes midair by two female terrorists who boarded from this same airport.

    Mr. ROGER CRESSEY (NBC News Terrorism Analyst): It seems like this is consistent with previous Chechnyan attacks, looking to kill as many people as possible and, in the process, embarrass the Medvedev government.

    MITCHELL: Reportedly among the 35 dead, two Britons; so far no Americans are known to have died. Experts say today's attack could lead to a greater crackdown in Russia , if only to ease international concerns about security in that country as it plans to host two major events, the 2014 Winter Olympics and the World Cup four years later. Brian :

    WILLIAMS: Particularly troubling because it was the part of the airport where you go to pick people up who've arrived and don't have to pass through security, of course. Andrea Mitchell in our Washington newsroom. Andrea ,

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