Lockdowns at the White House and Capitol on Tuesday over a potential airspace violation may have been because of a flock of birds, officials say.

A spokesperson for the North American Aerospace Defense Command (NORAD) told NBC News that the object causing the lockdown could have been "a flock of birds or a weather balloon."

The spokesperson also said the event was "resolved without incident."

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The White House and Capitol Building went into a brief lockdown earlier Tuesday.

The Secret Service said in a statement that the White House had been locked down "due to a potential violation of the restricted airspace in the National Capital Region."

Capitol Police said they were "tracking an aircraft that poses a potential threat to the Capitol Complex."

The lockdown was lifted shortly thereafter, with NORAD later saying there was "no aircraft" involved in the incident.