BOONEVILLE, Ark. - A meat packing plant exploded Sunday afternoon, injuring an unknown number of people and forcing homes to be evacuated because ammonia gas leaked into the air, state officials said. Flames poured out of the Cargill Meat Solutions plant just after 2 p.m., witnesses said. It wasn't immediately known how many homes were evacuated in the western Arkansas town of 4,000, emergency management spokeswoman Renee Preslar said. A hazardous materials team from Sebastian County was heading to Booneville, Preslar said Meredith Voges, 22, of Connecticut, said she heard the explosion while staying at a hotel just behind the...