PLEASANT HILL -- A man tricked someone into pulling out their iPhone Tuesday morning, then sprayed the victim in the face with an unknown substance and stole the gadget, police said.

The robbery took place about 11:20 a.m. Tuesday on Harvard Drive at College Way, police said. The victim, whose gender was not released, told police that a young man approached, asking for directions to a street.

The victim pulled out an iPhone and used a map program to get directions. The suspect asked to see the directions on the phone.

As the victim held up the device, the suspect sprayed the victim in the face, grabbed the phone and fled, police said.

The victim was temporarily incapacitated by the spray but was expected to recover.

The suspect was described as a black male in his late teens, 5'8", with a thin build and short black hair, wearing dark colored clothing.

Anyone with information on the robbery is asked to call Pleasant Hill police at 925 288-4630.

Contact Daniel M. Jimenez at djimenez@bayareanewsgroup.com. Follow him at Twitter.com/DMJreports.