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Videos show the Boston Marathon bombing investigation in full swing on Tuesday

Watch above as government officials provide an update Tuesday morning on the Boston marathon explosions investigation.

BOSTON – The FBI’s investigation into the bombings at the Boston Marathon was in full swing Tuesday, with authorities serving a warrant on a suburban Boston home and appealing for any private video, audio and still images of the blasts that killed three and wounded 140.

Two bombs blew up seconds apart Monday at the finish line of one of the world’s most storied races, tearing off limbs and leaving the streets spattered with blood and strewn with broken glass. Three people were killed, including an 8-year-old boy, and more than 170 were wounded.

Raw video from Boston on Tuesday morning shows eerily quiet streets that remained under heavy police presence:

President Barack Obama said the bombings were an act of terrorism, but investigators do not know if they were carried out by an international organization, domestic group or a “malevolent individual.” He said, “the American people refuse to be terrorized.”

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Watch the statement Obama delivered Tuesday morning below:

Federal investigators said no one had claimed responsibility for the bombings, which took place on one of the city’s biggest civic holidays, Patriots Day.

Law enforcement officials continue to look for clues in this video from Tuesday morning:

Mohammed Bada gives his reaction to the police searching his Boston apartment, which he shares with an individual who police sought for interview following the bombings:

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Global News’ The Morning Show interviewed Insignis Strategic Research Inc. terrorism expert David Harris on Tuesday, who provided analysis on the explosions:

A doctor treating the wounded said one of the victims was maimed by what looked like ball bearings, a sentiment confirmed by an unnamed person briefed on the probe.

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In this video, Boston doctors describe injuries to marathon explosion victims:

With files from Global News

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