A huge manhunt for the suspected Charlie Hebdo killers is underway. The NYT is tracking the latest (with a solid new feature that highlights what we know and what we don’t know.)

+ We’ve gotten better at tracking terror groups. But it’s more difficult when actors are part of what is known as a wolfpack: “A small group of people, often connected by family ties, stage an attack in their home country without getting direct orders or training from a larger organization.”

+ “I just went to get my daughter from daycare. As I got to the front door of the building, two masked, armed gunmen brutally threatened us. They wanted to enter, go up. I typed the code.”