HOUSTON -- Four people have been charged in connection with BB gun shootings around Rice University and along the Gulf Freeway, KPRC Local 2 reported Thursday.

Rice University and Houston police said Caitlin Barnett, 19, John Michael Chargois, 22, Paul Helton, age unknown, and Bonnie Mugg, 21, have been charged with felony aggravated assault.

Chargois, Helton and Mugg have been arrested. A warrant has been issued for the arrest of Barnett, who is a Rice University student.

Barnett and Chargois are the only two suspected to be involved in all of the shootings.

Four people were wounded by BBs while running on the soft city sidewalk around Rice University's perimeter on Sept. 6 and 7. Two of the shootings happened near South Main at Campus Entrances No. 3 and No. 4. Other shootings occurred near Greenbriar Drive at Rice Boulevard. One of the victims was shot then knocked to the ground as she walked on University Boulevard near Rice Village.

The BBs were fired from passing vehicles, police said.

The victims suffered minor injuries and did not seek medical treatment.

Police said other BB shootings were reported on Bissonnet Street and two were reported on the Gulf Freeway.

The BBs were allegedly fired from a white Ford Ranger owned by Barnett and a gray Ford Escape owned by Mugg, police said.

One of the Gulf Freeway victims followed the Ford Escape and got its license plate number. Investigators said she heard about the shootings near Rice University and contacted Rice University police.

"That was absolutely a key factor in solving this case," Rice University Police Capt. Dianna Marshall said. "Had we not had the plate number, we would never have been able to connect all the incidents together."

Rice police said officers found three BBs on the floor of the Ford Escape.