ISLAMABAD, Pakistan (AP) - Pakistani authorities arrested more than 200 people they fear may try to attack U.S. citizens in Pakistan, an intelligence official said Sunday. Security at Pakistan's international airports has been tightened to try to track followers of Saudi suspected terrorist Osama bin Laden, the official said. "We don't want any terrorism in our country against the Americans nor do we want our soil used for any such activity abroad," said the official. The arrests were made during a series of overnight raids in northwestern Peshawar, which borders Afghanistan, and in the capital of Islamabad, they said. Most of the detained were Afghan nationals. They have been detained for interrogation following reports that bin Laden's supporters may attack American targets in Pakistan or use Pakistan as a transit route to other attack sites, said the official.