FBI investigating after intelligence information indicated possible terror plot . The U.S. government has been on high alert since the Boston Marathon bombings in April 2013, when two bombs exploded near the finish line of that year's race. No arrests have been made and it is unclear whether this is a new threat . In addition to Los Angles , some other US cities have increased security .
FBI investigating after intelligence information indicated possible terror plot . TSA involved although possible threat not necessarily related to aviation . No arrests have been made and it is unclear whether this is a new threat . In addition to Los Angles , some other US cities have increased security .