The Capitol Visitors Center was evacuated on Friday morning.

“We have evacuated the CVC due to a suspicious package. We have not evacuated any part of the Capitol,” Capitol police spokeswoman Lt. Jessica Baboulis said.

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The evacuation comes as security screening was increased in the wake of the Boston bombings and discovery of ricin-laced letters sent to Sen. Roger WickerRoger WickerOvernight Defense: GOP chairman moves ahead with 0B defense bill | Lawmakers eye 355 ship navy | Senate panel seeks answers on shoot down of Syrian jet Lawmakers unveil bill to set 355-ship Navy Overnight Tech: Uber CEO resigns | Trump's Iowa tech trip | Dems push Sessions to block AT&T-Time Warner deal | Lawmakers warned on threat to election systems | MORE (R-Miss.) this week.

On Wednesday, portions of the Hart and Russell Senate Office Buildings were locked down due to suspicious packages and envelopes that ultimately proved to be harmless.

An all-clear signal was given at around 11:30 a.m. and people were allowed back in the Capitol complex.

This story was updated at 11:42 a.m.