By Irika Sargent

(CBS) – A west suburban family was present Monday afternoon when officers at the nation’s capitol opened fire on a suspect who may have been armed.

It was chaos when police told visitors to seek shelter inside offices.

The visitor’s center was put on lockdown, and so was the White House, as a precaution.

A man from Bolingbrook was touring the U.S. Capitol at the time with his wife and three children.

“All of a sudden there was a big commotion,” Sunil Shroff tells CBS 2’s Irika Sargent. “There was a very loud commotion, and I think it was the Capitol police, they ordered everybody to get down, they ordered everybody to get on the ground immediately.”

Law enforcement sources tell CBS News the suspect is 66-year-old Larry Dawson, who disrupted a session of Congress last October.

Charges have not yet been filed.

A female bystander between the age of 35 and 45 appeared to suffer minor injuries from the incident and was transported to the hospital, but no officers were injured, CBS News reported.