WASHINGTON (AP) -- Republican Mitt Romney and President Barack Obama are trading tough words over the handling of foreign attacks on U.S. diplomatic missions in the Middle East, injecting foreign policy into a presidential campaign that has pivoted on a sour economy.

Romney accused the Obama administration of showing weakness in the attack that killed the U.S. ambassador to Libya, Chris Stevens, and three American members of his staff. Romney blasted the initial statement from the U.S. Embassy in Cairo as disgraceful and "akin to apology," adding later, "t‘s never too early for the United States government to condemn attacks on Americans and to defend our values.’‘

However, the embassy statement came before the protesters had breached the embassy’s walls and was not an apology but an affirmation of the American policy of religious tolerance and respect. A statement by Secretary of State Hillary Rodham Clinton minutes before Romney‘s was released condemned the attack in Libya and said there was no justification for such violent acts.

Obama made a somber statement condemning the attacks and announcing plans to deploy additional Marines at diplomatic posts overseas. In an interview with CBS News’ "60 Minutes" later in the day, Obama said the episode showed Romney‘s penchant for having "a tendency to shoot first and aim later.’‘

"It appears that Gov. Romney didn’t have his facts right," Obama said.

On Wednesday night, during a rally in Las Vegas, the president said he had a message for the rest of the world: "No act of terror will dim the light of the values that we proudly shine on the rest of the world, and no act of violence will shake the resolve of the United States of America." "And make no mistake. Justice will be done" he declared.

It was a rare day in the U.S. campaign when foreign policy took center stage instead of the economy and the unemployment rate of 8.1 percent -- long the No. 1 issue for voters.

The four diplomats were killed on Tuesday as protesters overran and burned the U.S. Consulate in Benghazi, Libya. In a separate incident, the American Embassy in Cairo was breached by protesters, and the nation‘s flag was ripped down, although no deaths were reported.

U.S. officials are investigating whether the attack in Libya was a terrorist strike planned to mark the 11th anniversary of the attacks of Sept. 11, 2001. Initial reports were that both the Libya and Egypt events had been motivated by anger over an anti-Muslim film made in the United States.

The Obama and Romney exchange came with less than eight weeks remaining in the tight presidential race, a campaign that has remained close for months and is being fiercely waged in fewer than 10 battleground states.

Economic concerns could play a more prominent role on Thursday, when Romney appears at a rally in the Virginia suburbs outside Washington, D.C., and Obama holds an event in Colorado’s Denver suburbs. Obama carried both states in 2008, but they remain up for grabs and heavily contested by both campaigns.

The Federal Reserve was expected to announce Thursday whether it plans to take new steps to jumpstart the U.S. economy. Many anticipate that the Fed will release a third round of bond purchases aimed at easing long-term interest rates and spurring borrowing and spending.

The economy has been the top issue throughout the race, with recent surveys showing Romney with a narrow advantage over the president when it comes to plans for reducing the nation‘s unemployment rate of 8.1 percent. On foreign policy, Obama has held an edge on which candidate is better suited to handle international affairs.

Romney on Wednesday defended his decision to issue his criticism Tuesday night, at a time it was not yet known that Stevens had been killed. Asked if he would have done so had he known about the deaths, he said, "’m not going to take hypotheticals about what would have been known and so forth."

Some Republicans with experience in national security matters questioned Romney‘s handling of the events and top Republican leaders in Congress did not echo Romney’s remarks. Senate Republican leader Mitch McConnell said Obama "correctly tightened the security overseas." Asked about Romney‘s remarks, he declined to answer and walked toward his office in the Capitol.

Romney’s account didn‘t mesh completely with events in Cairo.

The statement that he referred to as akin to apology was issued by the embassy in Cairo at midday on Tuesday at a time the staff was aware of still-peaceful demonstrations in the area nearby. The mob breached the compound’s walls and tried to burn a U.S. flag about four or five hours later.

The embassy statement condemned "the continuing efforts by misguided individuals to hurt the religious feelings of Muslims -- as we condemn efforts to offend believers of all religions," and noted that religious freedom is a cornerstone of American democracy.

Romney added that the White House later "distanced itself" from the statement, saying it hadn‘t been cleared by senior officials in Washington. "That reflects the mixed signals they’re sending to the world," he said.

Obama said in the "60 Minutes" interview that the embassy was trying to "cool the situation down" and it was released "from folks on the ground who are potentially in danger."