President Barack Obama said Monday, "We still do not know who did this or why and people shouldn't jump to conclusions before we have all of the facts."
But many are speculating that the act is one of domestic terrorism.
"The deadly twin explosions that shattered the Boston Marathon initially look more like the work of domestic terrorists than an international terrorist network, researchers and analysts who study terrorism said on Monday," reports The Boston Globe. "Early reports suggest that the devices were crudely made — otherwise, they probably would have killed many more people — making it unlikely that they were the work of a foreign government or global terrorist group, such as Al Qaeda, the experts said."
Mark Ensalaco, expert on terrorism and political violence, and Brian Levin, director of the Center for the Study of Hate & Extremism at California State University, San Bernardino, join The Daily Circuit to discuss past domestic terrorism events and how those attacks will shape the Boston investigation.