Relatives of kidnapped American Paul Johnson are in seclusion as a deadline nears for his captors' demands to be met. Militants in Saudi Arabia have threatened to kill Johnson by today unless the kingdom releases al-Qaida prisoners. The kidnappers did not specify what time their deadline arrives. Johnson's son and other family members are believed to be staying at his sister's house in Little Egg Harbor Township, New Jersey. There's been no sign of activity at the home this morning. Reporters and nearly a dozen TV news crews are gathered outside. Candlelight vigils were held last night in Johnson's hometown and in Florida, where he lived before moving to the Middle East. Johnson has worked in Saudi Arabia for Lockheed Martin for more than a decade.