Not too concerned about political correctness, profiling or whether their speech is vitriolic or not, the Russians bluntly describe the probable terrorist terrorist bomber of Moscow's airport.

Russian investigators on Monday found a head of "Arab appearance" that is presumed to have belonged to the suicide bomber responsible for setting off the blast, Interfax said.

According to preliminary information, the bomber was a resident of the overwhelmingly Muslim Northern Caucasus region, Interfax said.