Transcript for Boston Marathon Explosions: 'Like a War Zone'
You're watching America this morning. America's number 1 in the early morning news. This city of Boston is waking up to face its new reality as a target of terror. In a heartbeat the big city events with a small town friendly feel went up in smoke. Shattered by two explosions -- what we know at this hour. At least three people are dead up to 150. People are injured many of them very seriously and investigators are scrambling for answers. -- mom Riley joins us now from Boston with the very latest warning to mind. Good morning -- good morning John it is a typical morning here in Boston one of many different -- mornings to come. Today residents were put on a brave face and head back to work after their city city was shattered by bombs. This morning the city of Boston is on heightened alert puts -- -- 44 hours after terror erupted. Thousands were celebrating patriots day running in the city's marathon -- just a few yards from the the finish line at 2:50 PM the first bomb explodes who. -- -- -- Table -- OK I don't know what they call this number right to. Chaos ensued -- the white smoke just seconds later another explosion. At least three people were killed including an eight year old boy more than a 140. Injured. The large -- with smoke and an ultimate chaos everybody running everywhere I -- quite a few. Casualties coming back I saw one guy -- legs gone at the knees and suddenly ankles and -- -- Shrapnel wounds and people decide that ahead and other things -- just not good. The bombs went off about four hours after the start of the race just fifty to a hundred yards apart first responders rushed -- -- -- local hospitals quickly mobilize some victims were transported by wheelchairs and stretchers one hospital officials said the scene looked like a war zone. President Obama was notified within minutes -- and promised action. I'm supremely confident that Bostonians wool pulled together take care of each other and move forward as -- proud city and as they do. The American people will be -- them every single step of the way. Officials are tracking multiple persons of interest including a man being treated in an area hospital as well as another individual who was seen trying to gain at. Access to restricted area. Five minutes before the blast. Yvonne Bradley live in Boston thank you from the FBI is launching a massive effort to find those responsible for the deadly attack. And we -- and bomb fragments loss a look at hundreds of videos from the finish line.
This transcript has been automatically generated and may not be 100% accurate.