UPDATE: Chattanooga police have found a vehicle matching the description of the one that struck and killed a police officer Saturday night.

PREVIOUS STORY: There is a large police presence on Port Drive in Hixson, according to the Chattanooga Police Department.

It is not clear if the police activity is connected to a Saturday night crash that caused the death of a police officer. 

We're hearing from neighbors in the area that they are unable to leave their homes. 

Channel 3 has a crew on scene.

We will keep you updated as we learn more.