Updated information:NEW YORK (Reuters) - The group that claims it has kidnapped a Wall Street Journal reporter in Pakistan has sent e-mail to news organisations threatening to kill him within 24 hours unless the U.S. government released Pakistani prisoners held in the Afghan war. The e-mail, sent to The Wall Street Journal, CNN and The New York Times, among others, accused reporter Daniel Pearl of being a spy for Israel. It also warned other U.S. journalists in Pakistan to leave the country within three days. "We have interrogated Mr. D. Pearl and have come to the conclusion that contrary to ...