The Secret Service is looking for the person or persons who threw a smoke bomb at the White House during last night’s “Occupy Wall Street” protests.

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Hundreds of people marched to the White House, the Capitol and the Supreme Court Tuesday to protest corporate influence in politics. 

POLITICO reported that the White House was temporarily put on lock-down Tuesday evening after a smoke bomb was thrown over the fence, according to an agent.

Occupy Congress protesters had been congregating outside the White House during the march.

The smoke bomb was thrown near the North Portico. Fire trucks and HazMat crews could be seen along Pennsylvania Avenue, which was closed down to pedestrians.

The North Side of the White House remained closed as of 11 p.m. as Secret Service and police conducted further investigations. People were allowed to leave from the South Side.

President Barack Obama was not at the White House during the incident.

Secret Service worked with MPD and Park Police to clear the scene.

No one was arrested in connection with the incident.

WJLA contributed to this report.