Ten days before the attack, Sri Lanka’s security services were warned that the little-known organization, National Thowheeth Jama’ath, was targeting churches. But no action was taken against the group, which is now blamed for the attacks. The government’s history of infighting appears to have contributed to the communication breakdown.

The details: Here’s what we know and don’t know about the attacks, which wounded about 500 people.

The victims: Funerals began on Monday. One woman, whose 11-year-old granddaughter was killed, cried: “There are so many bad people in the world. Why kill the innocents?” Read profiles of those who died.

Perspective: In the immediate aftermath of the attacks, the Sri Lankan government temporarily blocked access to social media sites. That was a good thing, our columnist writes in an Op-Ed.

Justices to offer view on L.G.B.T. rights

The Supreme Court announced on Monday that it would decide whether the Civil Rights Act of 1964 — which outlawed discrimination based on race, religion, national origin and, notably, sex — guarantees protections for gay and transgender workers.