NORWALK, Conn. -- A man who stabbed passengers on a casino-bound tour bus on Interstate 95 in Connecticut was fatally shot by state police, officials said Wednesday.

The unidentified man began attacking passengers around 10 p.m., state police spokesman Lt. Paul Vance said. The bus driver flagged down a trooper at a construction site.

As the trooper approached the bus, the suspect and a passenger "were engaged in physical combat, rolled off the bus and onto the pavement of the highway," Vance said.

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The suspect acted aggressively toward the trooper and was shot when he refused to drop his weapon, described as a "cutting instrument," Vance said.

The man died at a hospital. Two people were stabbed and another person suffered non-life threatening injuries when a bullet from the officer's gun ricocheted off the pavement.

The trooper wasn't injured.

The bus, carrying about 24 passengers, was headed from Chinatown in New York City to a Connecticut casino.

Police will "get all the facts and circumstances" from the passengers as part of the investigation, Vance said.

The northbound lanes of the interstate were closed more than seven hours from late Tuesday night until early Wednesday morning.