U.S. officials say Osama bin Laden's journal contains information about future terror plots, and shows the al-Qaida leader was communicating with other terrorists. Bin Laden is believed to have personally written the journal, which U.S. Navy SEALs seized from his compound in northern Pakistan during the May 2 operation that killed him. According to US officials, the notebook details the terror network's doctrine, potential targets and how to carry out attacks against them. It describes plots against the U.S. rail system and the importance of attacking the United States. . Meanwhile, the leader of al-Qaida in the Arabian Peninsula has warned the United States of more attacks in retaliation for the raid. In a statement posted on the Internet on Wednesday, Yemen-based Nasser al-Wahishi said Americans should not think the matter will be over with bin Laden's death and said what is coming is greater and worse. The warning came as U.S. Senator John Kerry announced he will travel to Pakistan next week in a bid to reset bilateral relations.