After the years of bombing, the area was scarred with huge gaping holes.

BBC: Afghanistan: Through veiled eyes

Born in the East End of London, the son of street traders, Herbert grew up in Whitechapel -- where Jack the Ripper once stalked his victims -- in an area badly hit by Second World War bombing raids.

CNN: UK bids farewell to chiller writer James Herbert

Other patients were also in the trauma area, separated by curtains, but there were no bombing victims there, the source said.

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The BBC's Jon Brain in Baghdad says the ambush happened during a night of tension in the area, as US troops continued their investigation into Thursday's bombing.

BBC: NEWS | Middle East | Iraqis protest at US 'terrorism'

Also on Monday, Kazakhstan's Ministry of Foreign Affairs issued a statement saying two foreign nationals arrested Saturday in the Boston area on immigration violations are from Kazakhstan and may have known the two Marathon bombing suspects.

NPR: Boston Bomb Suspect Charged; Religious Motive Seen

Hundreds of thousands of Boston-area residents remained shuttered indoors after a wild overnight shootout killed one of the men suspected of bombing the Boston marathon and set off a massive manhunt for another suspect.

FORBES: Boston Still Shuttered As Hunt For Bombing Suspect Continues

In clearing the area so quickly, authorities acted on lessons learned from past terrorist attacks such as the Oklahoma City bombing in 1995, the Atlanta Olympics bombing in 1996 and the September 11, 2001, attacks, according to security experts.

CNN: Past bombings prepared response in Boston

The municipalities hosting two New York City-area marathons Sunday will add police and clamp new security measures on runners and spectators following last month's bombing at the Boston Marathon.

WSJ: New York Area Races Increase Security After Boston Marathon Bombing