Residents of Boston and its surrounding towns are on lockdown as police search for a second suspect in Monday's marathon bombings. Massachusetts Gov. Deval Patrick has told residents to "stay indoors, with their doors locked." As the story develops, here's what we know:
- The prime suspects, Tamerlan and Dzhokhar Tsarnayev, were involved in violent exchanges with police last night that left older brother Tamerlan, 26, dead. Dzhokhar, 19, is now on the loose.
- The brothers' photos were released Thursday night by the FBI. Soon violence began in Cambridge when the brothers allegedly shot and killed an MIT police officer and then hijacked a car, keeping the driver with them. She escaped unharmed after a half-hour. When police caught up with the brothers, they began to throw explosives out of the car and engaged in a fire fight with police. As Dzhokhar escaped, he ran over his wounded brother, who later died.
- Dzhokhar, still at large, is a student at University of Massachusetts, Dartmouth. The school was being evacuated this morning.
- WBUR radio host Robin Young says she knows Dzhokhar, as he is a best friend of her nephew. She described him as "the light of the party . . . a beautiful, beautiful boy." Some who know him are shocked by the developments, and a high school classmate of Dzhokhar called him a normal American kid.
- An uncle of the suspects called the brothers "losers" and urged Dzhokhar to turn himself in. Yet his father, who was contacted living in Russia, called his son "a true angel." An aunt has also spoken out, saying they're innocent and that the older brother was "married to a Christian" and had a 3-year-old daughter.
- The suspects and their family reportedly legally immigrated to Cambridge, MA, in 2003 from Kyrgyzstan, where the older brother was born. According to their uncle, Dzhokhar Tsarnaev was born in Dagestan. They are reportedly of Chechen origin.
- Bombing victim Jeff Bauman helped identify the suspects. After coming to, he wrote a note: "bag, saw the guy, looked right at me."
See photos from Boston now.