A UMass Amherst student interning on Capitol Hill was fatally shot in Washington, D.C., after being caught in a dispute between rival groups, police said.

A reward of up to $40,000 is being offered for any information leading to the arrest and conviction of the person or people responsible for the death of a University of Massachusetts Amherst student in Washington, D.C.

The FBI's Washington field office on Tuesday offered $15,000 for information leading to the arrest of the gunman.