MILWAUKEE -- For the second time this week, I-43 became a crime scene during a rush hour shooting. One person was taken away by ambulance, and police are looking for a known suspect.

“Our investigators will pursue this subject and ensure that he is held accountable for his reckless behavior that endangered the lives of those on the freeway," Acting Sheriff Richard Schmidt said.

Around 5:00 p.m. a shooting on I-43 south closed the freeway and sent Milwaukee County Sheriff's Deputies searching for bullet casings. Two vehicles were pulled over on the side of the road under the Keefe Avenue overpass to speak to investigators, who were looking at what appeared to be a bullet hole in the driver side door of a silver SUV.

"This is pretty scary being the fact that I have four children and I just bypassed the shooting," said Brittany Thompson, who drove by the shooting.

On Monday, investigators were also searching the highway after a shooting on I-43 north near Walnut. Investigators say one vehicle fired into another. No one was hurt in that one and no arrests have been made. But it has people thinking twice about driving I-43.

"I've stopped the freeway for awhile from a couple of shootings ago that were directly on the freeway," said Richards.

"It has to stop, people are putting innocent people's lives in danger," said Thompson.