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

Potential psychological explanations behind bombings

A teenage immigrant with intellectual promise heads out on a sunny day into the streets of a large American city and decides to murder as many innocent strangers as he can. He’s in the company of an older man who has taken the place of his father, who has long been away in a distant country.

The teen is Lee Boyd Malvo, who at age 17 killed 10 people in the 2002 Washington, D.C.-area sniper attacks, but the description also fits the still-developing profile of Boston Marathon bombing suspect Dzhokhar Tsarnaev, whose father left their Cambridge home for Russia in 2010.

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