Two more explosive devices were discovered at the Boston Marathon after a pair of bombs went off at the iconic sporting event Monday afternoon, The Associated Press is reporting. A senior official told the AP that the newly discovered devices were being dismantled.

Officials also said during a news conference that a third incident has been reported at the JFK Library in Boston.

Homeland Security Secretary Janet Napolitano says her agency will provide “whatever assistance” is needed.

The Associated Press:

It was not immediately clear what kind of devices had been found Monday. The official said the first two did appear to be bombs.

The official spoke on condition of anonymity because he was not authorized to discuss the findings publicly.

The official said it was not clear what the motive was or who may have launched the attack.

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Read more from Truthdig about the Boston Marathon explosions here and here.

— Posted by Tracy Bloom.

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