The FBI wants to talk to two men captured on video near one of the sites of the Boston Marathon bombings, Homeland Security Secretary Janet Napolitano said at a public meeting Thursday morning.

"I wouldn't characterize them as suspects under the technical term, but we need the public's help in locating these individuals," Napolitano said when asked to give an update during a Committee on Homeland Security budget meeting.

"The investigation is proceeding apace," Napolitano added. "This is not an 'NCIS' episode. Sometimes you have to take the time to properly put the chain together to identify the perpetrators."

About 1 p.m. Thursday, the U.S. Attorney's office for the District of Massachusetts sent out a tweetencouraging anyone with information to submit clues, video or photos to an FBI webpage dedicated to the investigation.

"The FBI and its partners are actively investigating the explosions along the Boston Marathon route on April 15, 2013," the page states. "If you have images, video clips, and/or details regarding these incidents, please provide or attach them below. We appreciate your support."

The potential suspects and the renewed plea for information are the latest developments in a fast-moving manhunt that has consumed local and federal law enforcement since Monday, when two shrapnel-packed explosive devices detonated near the finish line of the Boston Marathon. The blast killed 3 people and injured 170, many seriously.

President Barack Obama and First Lady Michelle Obama flew to Boston to attend an interfaith memorial service Thursday. "Every one of us has been touched by this attack on your beloved city. Every one us stands with you," Obama told the crowd.

Obama honored the families of those killed in the blast -- Martin Richard, 8, of Dorchester; Krystle Campbell, 29, of Medford; and Lingzi Lu, 23, a Boston University graduate student from China.

Officials from the FBI and the Boston Police Department did not immediately return calls from Yahoo News. However, a message sent from the Police Department's Twitter account at approximately 9:40 a.m. suggested a possible pending development.

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