WASHINGTON (KSDK) - Senate officials remain on a partial lockdown in Senate buildings while authorities continue to investigate the Navy Yard shootings.
According to a spokesman from Sen. Dick Durbin's office (D-IL), Senators are now free to leave the building, but visitors are not accepted at this time.
Earlier, no one was allowed in or out of buildings while a second suspect was sought.
MORE: Senate postpones votes in response to shooting
The House remained open.
Authorities said as many as two gunmen opened fire Monday morning inside the Washington Navy Yard, killing at least 12 people in an attack on office workers at the heavily secured military installation in the nation's capital. One gunman was dead and police hunted for a second possible attacker.
Sen. Claire McCaskill tweeted Monday afternoon saying, "Senseless gun violence makes me sick. So Sad. Prayers for victims."
Associated Press information contributed to this report.