A police officer for the Massachusetts Institute of Technology (MIT) was shot to death on Thursday (April 18) night at the school's Cambridge campus, touching off a manhunt for a suspect or suspects in a community on edge just days after the Boston Marathon bombing.

According to several media reports the two suspects are the same depicted in photos released by FBI in connection with the Boston marathon explosions which killed three people and left several others severely injured.

MIT police were sweeping the campus early on Friday (April 19), according to a campus alert. Massachusetts State Police and Cambridge police said they were assisting in the investigation.

David Procopio, a spokesman for the Massachusetts State Police, said the motive for the shooting was not known and the investigation would be led by the Middlesex County District Attorney's Office after the death of the officer.

The shooting in Cambridge occurred as nerves were on edge in neighboring Boston, where two bombs exploded on Monday at the finish line of the city's famed marathon, killing three people and wounding 176.

The shots on Thursday night were reported near Building 32, MIT said in an emergency statement warning students to "stay indoors and away from the area."

Presented by Adam Justice