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A House aide was arrested trying to clear security at a congressional office building with a gun in his bag Thursday, prompting the U.S. Capitol Police to warn staffers to take safety precautions.

The man was Jeffrey Allsbrooks, a staff member in the House Chief Administrative Office – a nonpartisan outfit that provides “support services and business solutions” to House offices. Allsbrooks told the USCP that he forgot the handgun was in his bag. The department said it is charging Allsbrooks for carrying the gun without a license.

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The U.S. Capitol Police sent a security alert just before 8 a.m. ET Thursday telling staff to get inside the nearest office, stay away from external windows, remain quiet and to refrain from entering or exiting the building until given the go-ahead from police.