Here are 15 conspiracy theories about the Boston Marathon bombings that are spreading on social media.
This blurry photo taken after the bombing by spectator Dan Lampariello shows a man on a roof in the distance. The photo has since gone viral, but there is no evidence that this man has anything to do with the bombings.
A fake Twitter account, @HopeForBoston, began tweeting these photos of alleged “victims” they said died running for Sandy Hook victims. The account was deleted by Twitter.
Fox pulled a Family Guy episode that dealt with the Boston Marathon, that many believe predicted the bomb. There was a bomb in the March episode, but the clip that puts it at the marathon was faked. Seth MacFarlane sounded off on Twitter.
Many believe this now famous image is of a man who was going to propose to his girlfriend -- the woman on the ground -- before the bombs. The Boston Globe stated there is no evidence that any of that is true.
Many conspiracy theorists believe the bombing was a "false flag" -- which means the U.S. government orchestrated the bombing so they could pin it on some terrorist organization. This is a rumor investigators are asking people not to spread.
As of 6:58 p.m. on Monday, the New York Post's website was still stating that 12 people died. This has since been corrected to three dead, more than 150 injured.
A Twitter account, @_BostonMarathon, was disabled after it falsly stated that "For every retweet we receive we will donate $1 to the #BostonMarathon victims #PrayForBoston."
A Facebook page showing CCTV images of a man said to be the bomber are untrue, according to the FBI.
The New York Post stated on Monday that a Saudi national had been taken into custody as a "suspect." The FBI has since said that was never true. No one has been taken into custody.
Many believe deceased Sandy Hook Principal Dawn Hochsprung is alive after a photo of her as a survivor of the Boston bombings being interviewed spread on the Internet. The Fox News image is a fake and was never shown on TV.
The Associated Press originally reported that cellphone service in Boston had been shut down for fear that another bomb would be detonated with a mobile device. The AP later rescinded its report. Service was spotty, but it wasn't shut down.
A man who was near the finish line told Florida TV station local 15 that he saw bomb sniffing dogs at the start and finish lines before the bombs went off -- causing many to believe a tip was sent in. This conflicts with reports from authorities.
Reddit reports the 'Anonymous' group, communitcating through the website 4chan, discovered this photo while sifting through media footage.
Many have been Tweeting that the photographed victims of the bombings were "crisis actors," hired by the government to pretend to be casualties.
Many reports say the Westboro Baptist Church will be picketing funerals of those who died at the Boston Marathon. This has not been confirmed by the church.