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On Sunday, the White House was briefly placed under unofficial lockdown after two stray, possibly radicalized “party balloons” landed on the North Lawn, NBC News reports.

According to The Washington Post, Secret Service officials say “some party balloons floated over the executive complex, and a couple of the balloons landed on the property.” By 1:30 p.m., agents successfully cleared the scene.

In April, the Secret Service unveiled a plan to raise the White House fence by five feet following years of high-profile security scares. Most recently, agents shot an armed man at a White House guard booth after he refused to drop his weapon.