One of the Boston Marathon bombing suspects was shot and killed early overnight and a massive manhunt is on for the other.
The shooting happened outside the Massachusetts Institute of Technology.
MIT police exchanged gunfire with the suspects killing one; one officer was killed as well.
A transit officer was also injured in a firefight and is in surgery and several other people were wounded during a car chase and shootout.
The two have been identified as 19-year-old Dzhokhar A. Tsarnaev and his brother, 26-year-old Tamerlan Tsarnaev, who was killed.
The community is on lockdown while the second suspect is sought.