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. 2013 Jul 2;5:ecurrents.dis.ad70cd1c8bc585e9470046cde334ee4b. Originally published 2013 Jul 2. [Version 2] doi: 10.1371/currents.dis.ad70cd1c8bc585e9470046cde334ee4b

Keywords beginning with stem word ‘explo’ within first 20 minutes

There was just an explosion at Copley...seriously. Wtf...
Two explosions just rocked the finish line of the Boston Marathon. Sirens galore. People running in fear. Wonder what happened.
Did something just explode… twice in town? @*****
Just heard two large explosions at the #bostonmarathon
2 explosions just happened here on boylston st. #boston #bostonmarathon
first something exploded and then they made everyone clear the way so an ambulance could go through... #whathappened?
can someone tell me what that explosion was!? #boston #bostonmarathon
Holy **** there was explosions in Copley.
@***** @***** RT: @***** Large explosion on the Boston Marathon route,  area of 671 Boylston St. Possibly 60 people injured
That explosion in Boston just shook my house
Multiple explosions @ Boston Marathon
BREAKING NEWS: Two powerful explosions detonated in quick succession right next to the Boston Marathon finsh line this afternoon.
There was just a ****ing explosion on boylston street
Also what exploded
And then this. Why? “@*****: RT @*****: Live video from scene of Boston Marathon explosion http://t.co/mYxdURqnT8
what exploded
BREAKING NEWS: Two powerful explosions detonated in quick succession right next to the Boston Marathon finsh line this afternoon.
I am fine, I was literally by where the explosions happened less than 1 hour ago, my office is right by finish line
@***** I heard a loud BOOM and they are saying there were two explosions, seems many hurt
#BostonMarathon explosion, why why why !!!! http://t.co/eAGDM8F8wH
That explosion was definitely set up ....
were the explosions terrorist attacks?
"@*****: This explosion is scary
Jesus. MT @*****: Aerial shot of the finish line were the explosions happened. (Fox #Boston) http://t.co/8i86l45XlO
Multiple people are injured near the Boston Marathon finish line after two explosions. The #BostonMarathon has been stopped.
What explosion lol
I hope everyone is okay at the marathon from the explosion
Holy ****. Prayers go out to those injured/effected by the explosions at the finish line. Hopefully nothing else happens.
2 explosions at Boston marathon
So scared. Stuck in Boston because my car won't start and probably won't be able to get out bc of the explosions. Hope everyone is okay.
Bomb just exploded at the Boston Marathon #bostonmarathon
Two explosions @ the finish line of the Boston Marathon....horrific scene, hundreds hurt...bloody.  On no!  This is terrible.
My aunt literally just said she think North Korea is responsible for the Boston Marathon explosion
Two explosions by the finish line of #bostonmarathon
#BREAKING 2 explosions at Boston marathon finish line.
Some of these Boston Marathon explosion pics are gruesome.
**** my moms on the train I'm gunna explode
And then the city started to explode and we couldn't get out...........
@***** two explosions. Some major injuries.
Watching this explosion on the news is reminding me of 9/11 
Just heard two huge explosions in Boston. What is going on?