A series of highly coordinated bombings in Sri Lanka has left more than 350 people dead. How did a small, obscure and underfinanced local group carry out one of the deadliest terrorist attacks since 9/11? Guest: Jeffrey Gettleman, the South Asia bureau chief for The New York Times. For more information on today’s episode, visit nytimes.com/thedaily.

Background reading:

• The Islamic State claimed responsibility for the bombings, but the extent of its involvement is not yet clear.
• Here’s what we currently know and don’t know about the attacks.