A massive hunt is underway for 19-year-old Dzokhar Tsarnaev.
Boston officials said he is one of the two suspects in the Boston Marathon bombings that happened on Monday.
Commissioner Ed Davis with the Boston Police Department said, "We believe this to be a terrorist. We believe this to be a man who came here to kill people."
This morning law enforcement officers are going door-to-door looking for Tsarnaev and asking residents to stay in-doors.
Officers warn the teen is armed and extremely dangerous.
Kurt Schwartz the Massachusetts Dept. of Homeland Security said, "We are asking you to stay indoors, stay in your homes, for the time being."
The other suspect, identified as Tsarnaev TMs brother is dead.
He was killed when a shootout ensued around 10:20 p.m. Thursday night near the Massachusetts Institute of Technology.
A campus officer was killed and another one was injured in that shooting.