By Syma Chowdhry

PHILADELPHIA (CBS) — State police officials did not give many details about what took place when a gunman ambushed two troopers, killing one and injuring the other, but they had this message to the shooter: “You are a coward. You committed this spineless act and attacked defenseless troopers.”

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Deputy Commissioner George Bivens did not hold back with his words.

It has been three days since a shooter ambushed two state troopers during a shift change.

Police say a gunman opened fire at the Blooming Grove barracks Friday. That’s about 35 miles east of Scranton.

Corporal Bryon Dickson was pronounced at the scene. He and his wife just celebrated their 10 year anniversary.

Dickson was a US marine before he joined the Pennsylvania state police. He leaves behind two young sons.

Dickson was leaving the station as Trooper Alex Douglas was coming in. Douglas was injured and remains hospitalized.

“He is making steady progress every day.  Obviously he was very seriously wounded and he is going to have a long road to recovery.”

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Over the weekend, police questioned a person of interest, but he was not considered a suspect.

Police say the shooter used a rifle and may have military or law enforcement experience.

The gunman may have an issue with police, particularly with an on-going investigation at the Blooming Grove barracks, but police did not give more details. But they are determined to find the killer.

“We will find you and we will seek justice.”

Corporal Bryon Dickson’s funeral will be held Thursday morning in Scranton. He will be buried with full honors.

In the meantime, police say they’ve received hundreds of tips that they are following.

The reward has increased to $75,000.

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