Snopes.com, a website dedicated to fact checking urban legends and internet rumors, says there are several conspiracy theories and fake viral stories associated with the Boston Marathon bombing.
Here are a few:
1. Sandy Hook child killed in bombing
According to Snopes, the rumor that one of the bombing victims was an 8-year-old girl who attended Sandy Hook Elementary and/or was running for the victims of the Sandy Hook shootings is false.
"The child killed in the bombings was not a participant in the race and children are not allowed on the course," Snopes.com says in part.
2. Woman killed before boyfriend's proposal
A photo being shared by many on social media allegedly showed a man hunched over a girl with the quote: "The man in the red shirt planned to propose to his girlfriend as she crossed the finish line at the Boston Marathon, but she passed away."
Snopes reports that "it is likely the caption was a made-up one unrelated to whoever is pictured in the photo."
3. False victims
As seen in the aftermath of other tragedies, images of "victims" have gone viral, though many are not even related to the situation.
4. Man on the roof
Several photos of "suspects" have been circulating the web, like one of a walking figure on a rooftop building near the explosion.
"The figure in the photograph remains unidentified, but no concrete information ties that person to the bombings," the site says.
5. Saudi man
There have been conflicting reports of a 20-year-old Saudi man being questioned by investigators in connection to the bombings. At first, it was reported that he was a "person of interest." Later reports said he was just a witness, not a suspect.
Information from Snopes.com. Read more here.