Washington (CNN) The mysterious "slow-moving blob" detected in the skies over Washington Tuesday prompted a frantic response from security officials on the ground as they raced against the clock to assess the potential threat. A Capitol Police source told CNN the US Capitol went to "Aircon yellow" at 8:27 a.m., ET, when the object was first identified. AIRCON is the alert status triggered when an aircraft enters the restricted airspace in Washington without authorization. Asked during the early stages of the event if the object could be a drone, one source told CNN: "Still not known. "So, it's definitely possible that a future situation in which a radar "blob" like the one we saw yesterday could mask an attack.

Source: CNN November 28, 2019 11:03 UTC