During a press conference with law enforcement officials investigating the Boston Marathon bombings, FBI Special Agent Richard DesLauriers vowed to find those responsible for the horrific attacks.

“This will be a worldwide investigation, we will go where all worthy evidence takes us, we will go to to the ends of the Earth to identify the subject or subjects who are responsible for this despicable crime, and we will do everything we can to bring them to justice,” DesLauriers said.

Officials again asked spectators at the Boston Marathon to turn over any photographs from the marathon to law enforcement for examination.

“This is probably one of the most photographed areas in the country yesterday," Boston's police commissioner explained, adding that police are looking for media “taken just before and just after the blast.”