Four people are hospitalized and two people are being detained for questioning after a shooting Saturday morning in East Oakland, police said.

The four -- three males and one female -- were being treated for what police Officer Kevin McDonald described as non-life threatening injuries.

The first of the four victims was found when police received several phone calls about shots being fired near the 8400 block of International Blvd. around 7:30 a.m. Saturday, police said.

As additional calls were coming in, officers found two more people suffering from gunshot wounds on nearby 85th Ave.

All three victims were taken to local hospitals. As police investigated they were told there was a fourth shooting victim who was taken to a hospital before the first officers arrived.

Investigators have not released the names or ages of the people shot, or of the two people they're questioning.  No motive has been established, and no additional details have been released.

The shooting comes on the same day that Oakland and San Francisco police offered a gun buyback program intended to get firearms off the street.

The buyback program offers $200 each for up to three weapons per person. Only gun owners with verified residence in either Oakland or San Francisco qualify.