Two men were shot to death in East Oakland within a four-hour period Thursday night and Friday morning, authorities said.

Neither man’s name has been released.

At about 12:26 a.m. Friday, police responding to a shot spotter alert in the 3400 block of 35th Avenue found a 26-year-old Oakland man dead from gunshot wounds. A motive for the shooting is under investigation and no arrests have been made.

At about 9:28 p.m. Thursday, a 29-year-old Richmond man was found shot in the 1400 block of 17th Avenue. He was taken to a hospital, where  he later died. Police have not released a motive yet in the shooting and have not announced any arrests.

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The two killings bring to 14 the number of homicides investigated this year by Oakland police. The CHP has investigated two shooting deaths on highways in the city. Police had investigated 18 homicides at this time last year.

Police and Crime Stoppers of Oakland are offering up to $10,000 in reward money in each shooting for information leading to an arrests of suspects. Anyone with information may call police at 510-238-3821 or Crime Stoppers at 510-777-8572.