President Barack Obama, pictured, wants quick confirmation of Tom Wheeler and Rep. U.S. Mel Watt so they can start working right away. Reuters/Larry Downing

President Barack Obama, in his first statement on the Boston Marathon explosions, warned Monday evening that "people shouldn't jump to conclusions."

The president also did not use the words "terror" or "terrorist" during his brief press appearance at the White House, suggesting that his administration is exercising caution as it investigates the cause of the explosions, which took place near the finish line at the popular sporting event, killing at least three and injuring dozens more.

"We still do not know who did this or why. People shouldn’t jump to conclusions before we know the facts. But make no mistake. We will get to the bottom of this," he said, adding later that "Boston is a tough and resilient town, so are its people. ... The American people will be with them every step of the way."

Obama said that as more information comes out, his administration will pass it on to the press at other briefings, but that at this point authorities are still investigating the incident and who is behind it.

"On days like this there are no Republicans and Democrats. We are Americans united," Obama said during his speech, adding that "All Americans stand with the people of Boston. ... The Boston police, firefighters and first responders and the people of the National Guard responded heroically and continue to do so as we speak."

Obama also said the administration is directing all necessary resources to assist in the continuing response to the explosions, and the investigation.