Developing: Secret Service Locks Down White House Front Lawn

A security alert was triggered at the White House late Monday morning as the Secret Service locked down the front lawn, according to reporters on the scene.

Members of the press corps stationed on the driveway were immediately escorted into the White House briefing room, with no explanation initially provided.

The nature of the threat remains unclear at this time, and the situation is still developing. The Secret Service has not yet released an official statement.

More updates to follow as information becomes available.