In Washington, a senior U.S. State Department official said, "We are obviously concerned by the news. We're following developments closely and trying to determine the facts."
The U.S. Homeland Security Department was monitoring the situation but was not implementing any additional security measures in the United States, spokesman Brian Roehrkasse said.
The crash comes only days before Sunday's presidential election in the breakaway republic of Chechnya. Pro-Russian President Akhmad Kadyrov was killed by a bombing in May.A series of deadly explosions in recent years has claimed hundreds of lives in blasts that have been blamed mostly on Chechen separatist rebels.
The sad part is that there are people who just refuse to believe this is a World War! When hundreds of thousands are dead and our economy has stopped in it's tracks them it will be too late.