Minute-by-minute updates on the Boston explosions

Minute-by-minute updates from Boston, where two explosions killed at least two and injured dozens of others near the finish line of Monday’s Boston Marathon. Hundreds of Georgians were among the 26,000 who ran the race. Return frequently for updates.

5:51 p.m.: Area where explosions occurred to be closed for the "foreseeable future," Boston police says via Twitter.

5:47 p.m.: President Barack Obama is expected to address the nation at 6:10 p.m.

5:42 p.m.: Online Google link can help you find friends and family affected by the explosions in Boston.

5:40 p.m.: Death toll still at two, but number of injured climbs to more than 50.

5:27 p.m.: No one has claimed responsibility for the two deadly explosions, The Associated Press reports.

5:23 p.m.: Atlanta Track Club Executive Director Tracey Russell released the following statement: "We are deeply saddened to hear the news of today's events in Boston. Safety at every Atlanta Track Club event is our top priority. As it relates to security with any large-scale event in Atlanta, we work very closely with the City's Police and Fire Departments and Emergency Medical Service units, as well as the Federal Emergency Management Agency and additional government agencies. Our hearts go out to the entire Boston community and the victims affected by this tragedy."

5:18 p.m.: Here is the hotline for family members looking for information on Boston Marathon victims: 617-635-4500.

5:13 p.m.: Tuesday at 7 a.m., a moment of silence and run will be held at the Big Peach Running Co. in Midtown in honor of those killed and injured.

5:05 p.m.: Cell phone service shut down in Boston to prevent any remote detonations for additional explosions.

5:01 p.m.: More reactions from Georgia runners in Boston.

4:54 p.m.: Boston police commissioner urges people to stay indoors, not congregate in large groups.

4:50 p.m.: FAA orders no-fly zone over Boston explosion site.

4:30 p.m.: View the scene in Boston.

4:25 p.m.: Georgia's top finisher, Malcolm Campbell, crossed the finish line at 12:23 p.m. as the 36th finisher. Campbell, 42, of Marietta, said he mingled with other runners for an hour or so before heading back to his hotel a few blocks away. He didn't hear the explosions, but is trying to reach other friends and fellow runners. "It's not good," Campbell told The AJC. "If this was a terrorist event, the sport's landscape is going to change."

4:17 p.m.: Gwinnett County Commissioner Mike Beaudreau was among the runners. He texted home to notify his family he is OK. Read more.

4:08 p.m.: Boston Police Department confirms 2 dead, 23 injured in 2 explosions near marathon finish line, according to the Associated Press. Boston police will hold a press conference at 4:30.

4 p.m.: David Calhoun, from Dallas, Ga. tells Channel 2 Action News phone lines are jammed, but text messages are going through. Transportation in and out of Boston is shut down.

3:45 p.m.: Marietta native Michael Martin, who plays trumpet in the Boston Symphony Orchestra, posted the following on Facebook: "I'm in rehearsal at the hall, a few blocks from Copley Square/the finish line. Sirens everywhere. Praying all our friends are safe."