-- Students at the eight public schools that have been on lock-down will be released on time, spokeswoman Melissa Salmanowitz said.
"All schools will dismiss as usual today. We will have additional security at schools to help facilitate, and we continue to work with (local police) to ensure our schools are safe. Athletics scheduled at Eastern High School and Eliot-Hine Middle School have been cancelled. All other afterschool programming is on as scheduled," she said.
2:42 p.m. ET -- At this stage of the investigation, authorities have no reason to believe the Navy Yard shootings were a terrorist attack, said Mayor Vincent Gray. Police have yet to determine a motive, said Washington Police Chief Cathy Lanier.
2:35 p.m. ET -- Pentagon press secretary George Little has issued another statement saying Secretary of Defense Chuck Hagel has ordered flags to be lowered to half-staff.
2:29 p.m. ET -- Flights and buses in Washington are experiencing delays, and traffic is congested by several street closures, according to CNN affiliate WUSA.
2:26 p.m. ET --The Washington police chief announced the death toll of 12 fatalities.
2:20 p.m. ET --The U.S. Senate has recessed because of the shootings.
2:14 p.m. ET -- Washington police are asking that anyone with information on the suspect or suspects call the FBI at 800-CALL_FBI
2:10 p.m. ET -- Navy Secretary Ray Mabus announced how loved ones of Navy Yard employees can get information: "Family members of Washington Navy Yard employees looking for information about their loved ones can contact the Warfighter and Family Support Center at 202-433-6151 or 202-433-9713, Navy officials said Sept. 16."
2:07 p.m. ET -- At least 12 people have been killed in the Navy Yard shootings, Mayor Vincent Gray says.
2:05 p.m. ET -- At Washington Nationals' baseball stadium Lot B, where people have gathered to reunite with their loved ones, the evacuees from the Navy Yard have not yet arrived. There is no timeline for when the buses carrying them are expected to arrive.
Jacqueline Alston said she hasn't heard from her husband of 18 years, Ernest , who has worked as a custodial worker in Building 197 since 2008.
"Right now, only God is there with me. Right now, I'm asking God to let me hear that voice, to let me see that man again," she said. "All I know is I'm supposed to be patient, which I am trying to hold on, being patient and understanding, and ask God what created this problem? What started this?"
1:55 p.m. ET -- An elite FBI unit, the National Capital Response Team, which includes a SWAT unit from the Washington field office, is working to clear all Navy Yard buildings, according to authorities.
1:51 p.m. ET -- A naval commander says he witnessed a man being shot in the head.
1:49 p.m. ET -- Washington Police Chief Cathy Lanier is expected to hold another news conference within the hour.
1:37 p.m. ET -- There are still people inside the Navy Yard's Building 197, where the shooting incident began, according to CNN affiliate WJLA, which cites the Naval Sea Systems Command as its source.
1:33 p.m. ET -- Some background on the Navy Yard:
The 3,000-employee facility has a an annual budget of almost $30 billion.
It is the Navy's oldest land establishment, created by act of Congress in 1799, according to the Naval History and Heritage Command. On the Anacostia River, it was initially intended as a shipbuilding facility and once serviced the Navy's most famous vessels, including the USS Constitution.
But after it was burned during the War of 1812, the Navy Yard was transformed into a center for ordnance and technological development. The facility was the world's largest ordnance plant during World War II, but its military role diminished during the Cold War. Today, it includes the headquarters for Naval District Washington and a naval museum.
1:24 p.m. ET -- Via Twitter, a U.S. senator thanked authorities on the scene: "My thoughts are with the victims & families of today's tragedy. My deepest thanks to the brave responders on the scene.-TB #NavyYardShooting," said Tammy Baldwin, D-Wisconsin.
1:21 p.m. ET -- In announcing that three shooting victims transported to MedStar Washington Hospital Center are expected to survive, Janis Orlowski, the chief medical officer, said there were other "individuals at the scene who will not be transported because they are deceased."
The other three victims - one of whom was shot in the shoulder and another who was shot in the head - were transported via helicopter and were alert and responsive.
"They do have severe injuries, but we've been able to speak with all of them," Orlowski said. "They've not been able to give us any information about what happened to them."