MIT professor Nuno Loureiro was shot and killed at his Brookline home, officials said. The 47-year-old lab director was found with gunshot wounds Monday.

At least two people are dead and nine others are wounded after a mass shooting at Brown University. A manhunt is underway for the suspected gunman.

President Donald Trump vows "very serious retaliation" after an ISIS gunman killed two U.S. Army soldiers and an interpreter in a Syrian ambush, leaving three other soldiers wounded.