You can now read 10 articles in a month for free on BostonGlobe.com. Read as much as you want anywhere and anytime for just 99¢.

The Boston Globe

Metro

Bombs were designed to spew destruction outward

They may be among the most memorable images of Monday afternoon: bystanders tying tourniquets around injured peoples’ legs, runners knocked off their feet, and a man whose pants were completely shredded, with only the waistband and cuffs remaining.

The placement of the two bombs on the ground along Boylston Street meant they would spray their deadly shrapnel and cause the most injuries to people’s lower extremities, according to an Army surgeon who saw similar injuries while treating soldiers injured by improvised explosive devices in Iraq and Afghanistan.

Loading comments...

You have reached the limit of 10 free articles in a month

Stay informed with unlimited access to Boston’s trusted news source.

  • High-quality journalism from the region’s largest newsroom
  • Convenient access across all of your devices
  • Today’s Headlines daily newsletter
  • Subscriber-only access to exclusive offers, events, contests, eBooks, and more
  • Less than 25¢ a week