Obama: Boston review designed to prevent attacks

WASHINGTON (AP) — President Barack Obama says a national security review following the Boston Marathon bombings will look at whether there is more the government can do to stop people within the United States who might become radicalized and plan terror attacks.

President Barack Obama arrives for a news conference in the Brady Press Briefing Room of the White House in Washington, Tuesday.

One of the dangers the U.S. faces now, Obama said, is people who might decide to attack because of "whatever warped, twisted ideas they may have."

Obama said that based on what he's seen so far, the FBI and the Department of Homeland Security did what they were supposed to before the attack.

But he said the review was needed to find out whether more can be done to prevent this type of attack by people within the United States who may become radicalized.

Obama said, "This is hard stuff."