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   WATERTOWN, Mass. (AP) - Police say one of two suspects in the shooting of an MIT police officer is dead and a massive manhunt is underway for another, who is tied to the Boston Marathon bombing.

   Shortly after the MIT officer was shot Thursday night, police got a report of a carjacking in Cambridge, just outside Boston.

   Police say of the at-large suspect, "We believe this to be a terrorist."

   The FBI is investigating whether the fatal shooting of a campus police officer at the Massachusetts Institute of Technology and gunfire and explosions in a nearby town are related to the Boston Marathon bombings.

   A Massachusetts State Police spokesman said early Friday that one person suspected in the gunfire and explosions has been accounted for and one is at large.

   The FBI said it is working with local authorities to determine what happened.

   The MIT shooting on the Cambridge campus Thursday night was followed by reports of violence in nearby Watertown, about 10 miles west of Boston.

   State police spokesman David Procopio said there is a "strong possibility" the incidents are related.

   The MIT officer had been responding to report of a disturbance Thursday night when he was shot multiple times, according to a statement from the Middlesex district attorney's office and Cambridge police. It said there were no other victims.

   In Watertown, witnesses reported hearing multiple gunshots and explosions at about 1 a.m. Friday. Dozens of police officers and FBI agents were in the neighborhood and a helicopter circled overhead.

   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."

   Boston cab driver Imran Sais said he was standing on a street corner at a police barricade across from a diner when he heard an explosion.

   "I heard a loud boom and then a rapid succession of pop, pop, pop," he said. "It sounded like automatic weapons. And then I heard the second explosion."

   He said he could smell something burning and advanced to check it out but area residents at their windows yelled at him, "Hey, it's gunfire! Don't go that way!"

   MIT said right after the 10:30 p.m. shooting that police were sweeping the campus in Cambridge and urged people to remain indoors. They urged people urged to stay away from the Stata Building, a mixed-use building with faculty offices, classrooms and a common area.

   Hours later, MIT, which has about 11,000 students, said the campus was clear but the shooter was still on the loose.

   

   JACKSON, Miss. (AP) - State police in Mississippi say a murder suspect shot a Jackson police detective and then shot himself at police headquarters.

   Mississippi Bureau of Investigation spokesman Warren Strain said Friday that Jeremy Powell shot Detective Eric Smith before killing himself, in the first official description of how the men died.

  The state agency took over the investigation from the Jackson Police Department.

  The men died in a third-floor room Thursday where Smith was interrogating Powell. Powell had been arrested in connection with the stabbing death of a 20 year old Jackson man.

   Hinds County Coroner Sharon Grisham-Stewart says she will perform autopsies on Friday.

Two St. Louis Police officers are in the hospital after being shot Wednesday night while answering a home alarm call in Baden. The officers had been called to a boarded up home in the 900 block of Elias Avenue about 11 p.m.

Police say a man at the home fired shots at the officers without warning.

The officers returned fire, striking the suspect several times. He's in critical condition at St. Louis University Hospital.

Both officers were taken to Barnes Hospital. A 31 year old female officer was shot in the foot. A 26 year old male officer was shot in the back. Both are expected to recover.