Subsequently, Clarke said they found personal papers on three of the men at the bomb sites.

NPR: Police: Bombing Suspects Are British Natives

There were bonfires on some of the bomb sites and lights in some of the shops.

BBC: Witness

He also highlighted LAS controllers' problems in establishing which crews were free to be sent to the bomb sites.

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Our correspondent says small groups of people have been coming to the bomb sites to pay homage to the dead.

BBC: India presses Pakistan on blasts

But the blocks around the bomb sites remain closed to the public while Boston officials clean up the area and make sure the buildings are safe to occupy.

CNN: SHARE THIS

Only a small minority of teens who use the Internet have ever seen Web sites that have information from hate groups, show how to build a bomb or buy a gun.

CNN: Poll: Parents aren't watching 'Net-surfing teens

Private bomb disposal teams are contracted by German railway operator Deutsche Bahn and other companies to check that sites are safe when building works are planned.

CNN: Experts defuse unexploded WWII bomb in central Berlin

Their presence is sufficiently common that private bomb disposal teams are contracted by German railway operator Deutsche Bahn and other companies to check that sites are safe when building works are planned.

CNN: Experts defuse unexploded WWII bomb in central Berlin