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WASHINGTON-- President Barack Obama spoke from the White House Friday night following the capture of a suspect in the Boston Marathon bombing investigation.

"We owe an outstanding debt of gratitude..." to all law enforcement officers, " Obama said. "Why did young men who grew up...resort to such violence?...the wounded...deserve answers...we all deserve answers..."

"...Why did young men who grew up.....resort to such violence? Tonight we think of all the wounded, struggling to recover..."

".....all in all, it's been a tough week.." The President also recalled the tragedy in West, Texas, where many lost their lives in the fertilizer plant explosion on Wednesday.

The President says the capture of a suspect in the Boston Marathon bombing closes what he calls "an important chapter in this tragedy."

Obama spoke from the White House briefing room shortly after law enforcement took 19-year-old Dzhokhar Tsarnaev into custody in a boat in a Watertown, Mass., neighborhood. His older brother was killed earlier Friday in an attempt to escape police.

Obama says the nation owes a debt of gratitude to law enforcement officials and the people of Boston for their help in the search for the men.

Obama says there are still many unanswered questions about the Boston bombings, including whether the two men had help from others. He is urging the public to not rush to judgment about their motivations.

Nineteen-year-old Dzhokhar Tsarnaev had been holed up in a boat in a Watertown, Mass., neighborhood.

His older brother was killed earlier Friday in a furious attempt to escape police.

Obama was briefed on the situation throughout the day by Attorney General Eric Holder, FBI Director Robert Mueller and other national security officials.

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