(Illustration courtesy of the Phoenix Police Department)

Phoenix police have released a sketch of a suspect in a series of shootings that started in March.

(Stock photo courtesy of Phoenix Police Department)

An example of what police believe one of the suspect's cars looks like.

Another case has been identified as an attack by what authorities are calling a serial shooter in Phoenix.

On the evening of July 11, Phoenix police said a suspect shot at a vehicle in a residential neighborhood near 32 Street and E. Oak Street. Two people were in the car, but neither were hurt.

This is the most recent incident connected with a serial shooter who authorities suspect shot and killed seven people since at least March, and wounded multiple others.

The last known, connected shooting was almost a month before this one, on June 12.

The reward has been raised to $50,000 for any information leading to the suspect’s arrest.

Some of the past shootings were in Maryvale, and had several things in common: they happened on weekend nights, the victims were shot near homes and the motive was unclear.