At around 10 a.m. this morning, there was "a loud noise" heard outside the White House. Shortly afterward, the White House went on lockdown. Additionally, at around the same time, a nearby food truck caught on fire and a bomb-sniffing dog detected "something" on a suspicious vehicle. Which, if any, of these events are connected? Reports differ.

According to Breaking News' Cory Bergman, the suspicious vehicle triggered the security alert and the loud noise was caused by the flaming food truck. The Associated Press reports there is "no indication" the two events are connected. Everyone, however, agrees on one thing: There was a loud noise at the White House.

UPDATE - 11:45 a.m.: A secret service spokesperson tells The New York Times that the lockdown was triggered by a bomb-sniffing dog "alert[ing] its handlers to examine a car" near the White House. The food vendor fire reportedly did not appear to be related.

UPDATE - 12:40 p.m.: CBS News reports that both the fire and the suspicious vehicle have been "contained and cleared." President Obama's flight to Selma today was delayed by about an hour by the security alert.