Boston Police: No arrest made in Boston Marathon bombing [Updated]

Two days after improvised explosives rocked the Boston Marathon, killing three and injuring at least 170 more, investigators have reportedly arrested a suspect in the attack. [UPDATE: The Boston Police and federal officials have stated that no arrest has been made in the Boston Marathon bombing case, despite numerous news reports claiming otherwise. However, reports that a suspect has been identified have held up thus far.]

CNN, the Boston Globe, the Associated Press, and Fox News report that a suspect is in custody. However, NBC and CBS maintain that no one has been arrested. [UPDATE: CNN has walked back its initial claim, now reporting that no arrest has been made.]

Multiple news reports early Wednesday afternoon said surveillance footage obtained by investigators showed what they believe is the suspected attacker carrying and planting a backpack at the site of the second explosion.

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According to the Boston Globe, citing an official familiar with the investigation, investigators believe they are "very close" to cracking the case. That official added that authorities may announce their findings as soon as this afternoon.

A press conference is already scheduled for 5 p.m. tonight.

According to CNN, surveillance footage obtained by police led to the reported breakthrough. From CNN's Tom Watkins:

On Tuesday, investigators revealed that they believed the improvised explosives used in the attack were shrapnel-laden pressure cookers stuffed into backpacks.

UPDATE: The FBI has released a statement saying there is no suspect in custody:

Editor's note: The headline for an earlier version of this story stated that a suspect had been arrested, based on reports from CNN, the Boston Globe, the Associated Press, Fox News, and others. Those reports, however, seem to have been premature.