REPUBLIKA.CO.ID, BOSTON - US President Barack Obama told a memorial service for the Boston bombing victims that "we will find" whoever carried out the attack that killed three people as investigators search for two men seen on a video of the scene shortly before the blasts.

Obama said Americans would not be intimidated by the twin blasts, which also injured 176 people in a crowd of thousands at the finish line of the world-famous marathon on Monday.

"If they sought to intimidate us, to terrorize us, to shake us from those values ... that define us as Americans, it should be pretty clear by now that they picked the wrong city to do it to. Not here in Boston," Obama said at the memorial on Thursday.

While investigators have made no arrests yet, Obama said of the perpetrator or perpetrators of the attack, "We will find you and you will face justice." Homeland Security Secretary Janet Napolitano earlier on Thursday in Washington confirmed that the FBI was searching for people seen on a video taken near the finish line. 

"There is some video that has raised the question of those that the FBI would like to speak with," Napolitano said in Congressional testimony on Thursday. "I wouldn't characterize them as suspects under the technical term. But we do need the public's help in locating these individuals."

The Boston bombings put Americans on edge and security was tightened in major cities across the United States. Mail sent to Obama and federal officials that authorities believed contained the deadly poison ricin, reminded Americans of anthrax mail attacks in the wake of the Sept. 11, hijacked plane attacks nearly 12 years ago.

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