A CBS reporter on-site tweeted images of Secret Service personnel seeking shelter behind trees on the White House lawn
Details of the suspects taking photos of Stuttgart airport were passed to German police by Morocco's secret service, reports say
The alert sparked concern for some passengers and several social media users contacted the airport
Police: "A bystander with a pistol confronted the shooter outside the restaurant and fatally shot him"
Power outage and zombie alert issued for residents of Lake Worth and Terminus
The civil protection units are on alert
A status not seen since the Cold War ended in 1991
Terrified travellers were filmed running out of the station in the north of the capital after police responded to a "security alert"
Passengers told of possible threat before take off
The driver fled the scene and security services are currently looking for them and the vehicle