TBILISI, Georgia (AP) -- The FBI said Wednesday that a grenade thrown in the crowd during last week's speech by President Bush in the Georgian capital was capable of exploding and was considered a threat against the president. The statement by agent Bryan Paarmann contradicted initial reports by Georgian officials that the grenade was not capable of exploding and had been found on the ground. The grenade, wrapped in a dark handkerchief, fell about 100 feet from the podium where Bush was speaking May 10 and "simply failed to function," he said. "We consider this act to be a threat...