Details at the source.

On Monday, it became official: Dzhokhar Tsarnaev was charged with “use of a weapon of mass destruction” and “malicious destruction of property resulting in death,” for his alleged role in last Monday’s bombing of the Boston marathon. The federal criminal complaint comes three days after police captured Tsarnaev in a boat in Watertown, Mass., and four days after a manhunt for these specific suspects began in earnest. For the time being, law enforcement officials believe Dzhokhar and his older brother, Tamerlan, who was killed Friday, acted alone.

Dzhokar and Tamerlan’s motive—or motives—are is still unclear. But that’s not the only unknown. Many of the Tsarnaevs’ actions last week seem baffling in retrospect. Here are some of the most confounding things they did:

1. Wear a backwards hat and no sunglasses.
2. Not react to the explosions.
3. Leave the car in the shop.
4. Stay in Boston.
5. Kill an MIT police officer.
6. Run out of cash.
7. Not understand how ATMs work.
8. Confess to the hostage.
9. Stop for snacks.
10. Keep the hostage's phone.
11. Bring a BB gun.

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