AP
Police clear the area at the finish line of the 2013 Boston Marathon.
Investigators have a suspect — a Saudi Arabian national — in the horrific Boston Marathon bombings, The Post has learned.
Law enforcement sources said the 20-year-old suspect was under guard at an undisclosed Boston hospital.
It was not immediately clear why the man was hospitalized and whether he was injured in the attack or in his apprehension.
The man was caught less than two hours after the 2:50 p.m. bombing on the finish line of the race, in the heart of Boston.
12 DEAD, 50 INJURED AFTER 2 EXPLOSIONS ROCK BOSTON MARATHON
NY AUTHORITIES RAMP UP SECURITY AFTER BOSTON EXPLOSIONS
PHOTOS: EXPLOSIONS ROCK BOSTON MARATHON
In addition, Boston police have has surveillance video of someone bringing multiple backpacks to blast site, according to CBS News.
Police also confirmed that there was a third explosion, at the John F. Kennedy Presidential Library and Museum. It was not immediately clear how much damage was done or whether it was related to the bombings at the marathon finish line.
The library bombing occurred about 4:30 p.m. and more than a mile from the marathon.
A law enforcement source confirmed to The Post that 12 people were killed and nearly 50 were injured in today’s blast.
WarSclerotic 
April 15, 2013 at 11:29 PM
Is Obama getting the message? That’s the question. Our hearts with those who were hurt by those abject attacks. From Israel with love, sorrow and hope.
April 15, 2013 at 11:48 PM
Obama’s got all the protection he needs, unlike the rest of us. Pennsylvania Avenue is now closed.
April 15, 2013 at 11:52 PM
I’m gonna break my own rules here. My favorite cousin is in Boston. I haven’t heard from him yet…
FUCK ISLAM !!!!!! DEATH TO TERRORISTS !!!!
April 16, 2013 at 3:15 PM
I second that!
April 16, 2013 at 2:31 AM
I just don’t get it. I listen to President Obama’s message today and he called it a tragedy. He didn’t have the guts to call it what it was: terrorism. Which is why I’ve lost all hope in this country.
April 16, 2013 at 3:19 PM
Without a doubt, Obama is moving to treat this ‘event’ as a criminal matter.
April 16, 2013 at 4:39 AM
is the suspect a sunni or shiite cause im starting to think this could have been hezbollah, al qaeda usually kill themselves also and take credit quickly either media blacking out there response but i havnt found one, this leads me to think other arab factions also hezbollah is known for use in ball bearings which was used in boston, however what would a saudi national be doing with hezbollah
April 16, 2013 at 2:58 PM
its not al quida white smoke its homemade explosives look at the size and positioning none of its typical,the fbi suspect NK iran and there string pullers hence obamas carefully worded speech,debka is wrong as usual when it comes to America
April 16, 2013 at 3:22 PM
Reports indicate it was gunpowder. Unusual but obviously effective.
April 16, 2013 at 3:36 PM
You know steve it sound s like people who are not familiar with the usa as why homemade gunpowder its NK iran thats what homeland defense think and that came from them whats more there saying if it is its curtains for russia iran nk and china
April 16, 2013 at 4:07 PM
My thoughts also. This could be a state sponsored attack.