PHOENIX — Police are offering a $30,000 reward in the case of a possible serial shooter or shooters behind as many as eight shootings in Phoenix, it was announced Tuesday.

“Someone out there knows who did this,” Phoenix Police Chief Joe Yahner said in a release.

The Phoenix Police Department had already established that four of the shootings were linked. However, a review of all shootings since Jan. 1 of this year unveiled an additional four cases.

Police released a full list of the shootings and a composite sketch:

About 11:30 p.m. on March 17, a 16-year-old male was shot while walking in the street near 11th Street and Interstate 10. His injuries were not life-threatening.

About 11:30 p.m. on March 18, a 21-year-old male was shot while standing in the street outside of his vehicle near Indian School Road and 75th Avenue. His injuries were not life-threatening.

About 9 p.m. on April 1, Diego Verdugo-Sanchez was shot and killed in front of a home near 59th and Campbell avenues.

About 4:30 a.m. on April 19, 55-year-old Krystal Annette White was found deceased from apparent gunshot injuries sustained near 32nd and Van Buren streets.

About 9:50 p.m. on June 3, Horacio De Jesus Pena was shot and killed in front of a home near 67th Avenue and Thomas Road.

About 9:30 p.m. on June 10, Manuel Castro Garcia was shot and killed in front of a home near 67th Avenue and McDowell Road.

About 2:35 a.m. on June 12, an unoccupied vehicle was shot and damaged near Camelback Road and 83rd Avenue.

About 3 a.m. on June 12, Angela Linner, Maleah Ellis, and Stefanie Ellis were shot and killed in front of a home near 63rd Avenue and McDowell Road.

If all eight incidents were carried out by the same person or group, they could be charged with as many as five homicides and a slew of other shooting-related charges.

In an effort to catch the shooter or shooters, Silent Witness is offering up to a $30,000 reward for information in the case.

“We need our community to call us or Silent Witness and help us solve these cases, bring justice to these families and victims, and prevent more violence from occurring,” Yahner said.

The United States Marshal’s Service, the Bureau of Alcohol Tobacco and Firearms, the Maricopa County Attorney’s Office, the Department of Public Safety and the Federal Bureau of Investigation are all assisting with the case.

Anyone with information on the shootings is asked to contact Silent Witness at 480-WITNESS.

Follow @KTAR923