Terrorists might be able to slip through U.S. borders using visas meant for visitors participating in cultural, arts or sports events, says the FBI. In a bulletin issued yesterday to 18,000 state and local law enforcement agencies nationwide, the agency did not identify the source of the intelligence or give specific evidence, the Associated Press reported. "Recent intelligence indicates that terrorist groups may be interested in exploiting cultural visa programs to infiltrate operatives and support network into the United States," the bulletin says, according to the AP. U.S. officials point out spies and defectors have used foreign sports teams or...