This is off the CNN site. No other jets that took off before, or after went down. Although that doesn't 100% rule out fuel..... Both jets were also heading to southern Russia, near Chechnya.
Russian authorities offered no explanations for the crashes but said they had increased security at airports following an explosion at a Moscow bus station earlier Tuesday, which injured three people.
"If this were just one, you would look toward some sort of aircraft issue," Peter Goelz, a former managing director of the U.S. National Transportation Safety Board, told CNN.
"But with two of them going down so close together, it's awfully ominous."
The incidents also took place just days before a regional election in the rebellious southern territory of Chechnya, where Russian troops have battled separatist guerrillas for five years.