Russia Mourns Dead in Air Crash, Questions CauseBy Nathan Pettingill UZLOVAYA, Russia (Reuters) - Russia on Thursday observed a day of mourning for at least 89 people who died in a mysterious double air disaster, which some fear could have been a terrorist attack ahead of a key election in rebel Chechnya. Flags flew half-mast and comedies were pulled from theaters and television schedules as relatives of those who died in the Tuesday's still unexplained plane disasters arrived at the crash sites to help identify the dead. Russian media scorned official statements that the two plane crashes within minutes of...