6:13: Boston University confirms that one of the victims killed was a grad student there. The student, whose name has not been released, was with two friends watching the marathon, BU Today reported.
2:06: Breaking: Second victim identified in the Boston Marathon bombings as Krystle Campbell of Arlington (via @BostonGlobe)
1:00: Eight-year-old Martin Richard's father, Bill Richard, releases statement on son's death: "My dear son Martin has died from injuries sustained in the attack on Boston. My wife and daughter are both recovering from serious injuries. We thank our family and friends, those we know and those we have never met, for their thoughts and prayers."
12:25: Boston Marathon explosives were in 6-liter pressure cookers and placed in black duffel bags, person briefed on investigation says. (via @AP)
12:21: Boston opens Park Plaza Castle as Resource and Information Center.
11:32: President Obama calls incident "act of terror." "We will find whoever harmed our citizens, and we will bring them to justice," Obama says.
11:30: Watch President Obama talk about the Boston Marathon bombing from the briefing room.
11:19: Children's Hospital doctor says kids had BBs and nails embedded in their bodies. (via @BostonGlobe)
11:14: President Obama set to speak at 11:30.
11:10: Hancock Tower, Prudential Center are open, allowing employees to go back to work (via Boston.com)
10:58: FAA imposes ground stop at Boston's Logan Airport (via WHDH-TV)
10:50: Security incident aboard US Airways Flight 1716 at Boston's Logan Airport. (via @TheMatthewKeys)
10:49: Brigham & Women's Dr Ron Walls: 1 amputation, two others threatened limbs. Trying to save those limbs. Some second surgery. (via @RobiWBZ)
10:47: ProPublica has put together a roundup of resources to help you get through the aftermath of the explosions.
10:41: CNN reporting that 8-year-old killed in bombing has sister who lost her leg and mother has brain injuries.
10:37: Defense Secretary Chuck Hagel calls Boston bombings 'cruel act of terror' (via @AP_Ken_Thomas)
10:26: Increased security in all Boston-area hospital (MGH doctor). Doctor describes shrapnel removed from patients as "pellets" and "nail-like."
10:22: MGH doctor says almost all amputees were total amputees, adding that doctors were only completing what the bomb already started.
10:13: Mass General Hospital Update: 8 are in serious condition, had to undergo surgery with some getting amputations. "Patients are sick, but in a stable condition." Doctor says that shrapnel was removed from patients. Four amputations have been done; two limbs in "at risk" of amputation. Doctor says all patients American. Victims range from 20-years-old to 70-years-old. Most of the patients are conscious, but some are medically sedated. Doctor said between 6-8 are medically sedated. Prognosis will "probably be okay." "Still things to be done," says doctor. First patients may be ready to be released in a few days.
10:06: Boston Police: 176 casualties- 17 are critical and 3 dead.
10:00: To submit your photos or videos of Boston Marathon attack, call 1(800) CALL-FBI for FBI or 1 (800) 494-TIPS for BPD. (via @AlexJamesFitz)
9:57: Mass. State Police official says enhanced security presence may be seen at Boston's Logan Airport (via @TheMatthewKeys)
9:56: Boston Police: crime scene has been reduced from 15 blocks to 12 blocks. Expect area to be active investigation site for days.
9:50: Boston.com reporting that several area-college students were injured in the blast. Three Tufts students, seven Emerson College students and a Boston University student are among the injured. The students from Tufts and Emerson College all recieved non-life threatening injuries. However, Boston University's president reported that the BU student was in critical condition.
9:47: FBI SA Richard DesLauriers says that no additional threats after the bombing. He said, bomb blast still an "active investigation."
9:43: Boston Mayor Menino takes over the presser, talks about the heros of yesterday's incident and asks Bostonians to continue to pull together. A resource center has been set up in the city. "This is a bad day for Boston. But Boston will overcome," Menino said.
9:41: Mass. Gov. Deval Patrick heads the press conference this morning. He says the FBI has taken over the investigation and that only two bombs--the ones that exploded--were found. Over 150 people were injured in the blast. Patrick says people should expect heightened security in Boston.
9:39: For those who have no cell service in Boston, can use this website to make calls to friends and family.
9:33: Boston authorities are scheduled to release the latest updates in a press conference. Mass General Hospital will hold a press briefing at 10:00 a.m.
9:30: The first victim of the explosions has been identified as Dorchester-native 8-year-old Martin Richards, who along with his mother and sister, was waiting for his father to finish the race. According to the Boston Globe, Martin's mother and sister suffered "grevious injuries."
Officials said that the victim counts stands at three dead and at least 144 people hospitalized. CNN is reporting that at least 17 people are in critical condition and 25 are in serious condition. It's also reporting that at least 8 of the patients are children.
Boston.com reported that the Lenox Hotel is making plans to open back up for guest this morning so they can retrieve their belongings. The Mandarin Oriental Boston and Charlesmark Hotel remain closed.
Yesterday two explosions killed at least three people at the 117th Boston Marathon and left over 100 injured. As of today, police have not taken anyone into custody for questioning. The Boston FBI Division has asked anyone with information or images to please contact them. "No piece of information or detail is too small," it said yesterday.
CNN is reporting that a Saudi college student, who was injured in the blast, was being questioned by police, but is not being considered a suspect.
The blast occurred at 2:50 p.m., a few hours after the elite runners had ended their run, the Boston Globe reported. A law enforcement official told the paper that about 30 people were taken to hospitals under Code Red, which could signify a rise in the death toll.
For all updates from yesterday, please check out our live blog. We will be updating throughout the day today with all the latest updates, videos and photos.