LOS ANGELES (Reuters) – A Palestinian filmmaker on his way to the Academy Awards said on Wednesday he was held at Los Angeles International Airport and threatened with deportation before being allowed into the United States. Emad Burnat, whose "5 Broken Cameras" is competing for an Oscar in the Best Documentary Feature category, said U.S. immigration officials took him, his wife and 8-year-old son aside when they arrived in Los Angeles from Turkey on Tuesday evening. "Immigration officials asked for proof that I was nominated for an Academy Award … …