The name of the trooper has not been released pending notification of family.
Raw video from the Action Cam at the scene of the trooper shooting:
Raw video: Trooper shot at Wawa store in Bear, Del.
The barricade situation is happening in a home on the 500 block of St. Michaels Drive in the Brick Mill Farms Development.
Police say the male suspect is refusing orders to surrender and has fired shots at officers.
It is believed that he is inside the home by himself. Hostage negotiators were trying to establish contact with the man.
A heavy police presence could be seen from the Action Cam and Chopper 6.
RAW VIDEO: Chopper 6 over search for trooper shooting suspect
Raw video: Trooper shooting suspect search in Middletown, Del.
Residents in the area are being told to stay inside their homes and lock their doors until notified otherwise.
The trooper was shot around 12 p.m. Wednesday at the Wawa store on Pulaski Highway (Route 40) near Salem Church Road.
While the exact circumstances of the shooting have not been released, a witness tells Action News the trooper was on the ground when the suspect shot the trooper execution-style.
The trooper was rushed to the hospital in critical condition.
Another witness told Action News the suspect pushed the trooper at first.
"I guess he was trying to get to the car or whatever. I didn't understand it, I thought he was trying to push him and get away. He pushed him then he started shooting."
Meanwhile, a lockdown has been lifted for the Appoquinimink School District in the Middletown, Delaware area. Those schools had been locked down amid the search for the trooper shooting suspect.
Stay with ABC7 News for the latest details on this developing story.