Boston Marathon Suspect Killed

One suspect in the Boston Marathon bombings was killed early Friday morning, following an attack on police officers in Watertown that involved explosives and gunfire.

The second suspect is being sought.

The man known as suspect 2, wearing a white hat, is the suspect still on the run, according to Channel 5 News in Boston. Sources say the situation "fluid and dangerous."

State police spokesman David Procopio said, "The incident in Watertown did involve what we believe to be explosive devices possibly, potentially, being used against the police officers."

The situation was linked to the fatal shooting of an MIT police officer on Laurel and Dexter Streets in Watertown, late Thursday night.

Teams of police officers and FBI agents are roaming the neighborhood, with choppers overhead.

A State Police spokesman says an MBTA police officer was wounded in Watertown.

"I can confirm that a Transit Police officer was wounded. He is being treated at this hour at a local hospital," said spokesman Joe Pesaturo.