Boston is in lockdown after a shootout between the two Boston bombing suspects and police. One of the two is dead, as is at least one police officer; the other suspect fled on foot and is the subject of a massive manhunt. The two, identified online as 19- and 26-year old immigrants from or via Chechnya, reportedly robbed a convenience store late Thursday evening, killed an MIT campus police officer, hijacked a car, then led police on a chase that culminated in an exchange of gunfire. The Boston Globe and Reuters’ liveblog have the latest. [NYT]