President Barack Obama continues to receive updates from the FBI and his national security and homeland security team on the situation in Boston. He has also been in contact with authorities in Boston.
Throughout the day Friday, Obama received briefings from his national security team as dramatic events played out in Boston, where authorities continued their intensive search for the second bombing suspect.
Briefings took place in the White House Situation Room, and the Oval Office, with Vice President Joe Biden taking part.
Officials briefing Obama included counter-terrorism and homeland security adviser Lisa Monaco, and at various times FBI Director Robert Mueller and Attorney General Eric Holder.
Earlier, Homeland Security Secretary Janet Napolitano, Secretary of State John Kerry, and CIA Director John Brennan joined by video conference.
A White House official said the president placed calls to Massachusetts Governor Deval Patrick and Boston Mayor Thomas Menino to express his condolences for the Massachusetts Institute of Technology police officer who was killed overnight.
Obama told them that entire country is behind the people of Boston and Massachusetts, and said the full force of the Federal Government would continue to be made available until those responsible are brought to justice.
Secretary Kerry spoke briefly at the State Department about the situation in Boston.
"I think it is fair to say that for this entire week we have been in a pretty direct confrontation with evil and I want to congratulate and thank all the law enforcement authorities that they have been doing on behalf of our citizens," Kerry said.
Friday's scheduled White House news briefing was postponed indefinitely. It's not known what communications or discussions Obama has had with foreign leaders about the investigation into the Boston bombings.
The president spoke Thursday in Boston at an interfaith service for the three killed and more than 170 wounded in Monday's attacks.
He vowed again that those responsible for the Boston Marathon bombings would be brought to justice.