OAKLAND -- A man fatally shot last weekend -- one of three people gunned down along city streets on the same day -- has been identified as 37-year-old Vitorrio Jackson.

Jackson, of Oakland, was one of three men killed March 31 during separate shootings in the city that took place over a span of about 10 hours. No arrests and no motives have been announced in the slayings, which remain under investigation, police said Monday.

Police have not yet said if they believe the fatal Oakland shootings were connected.

Jackson was gunned down just before 4:10 p.m. in the parking lot of an East Oakland laundromat in the 8900 block of International Boulevard, police said Monday.

Police said they believe multiple people witnessed the shooting, but no one has come forward to speak with officers.

About six hours earlier, 31-year-old John Sonny Davis was shot as he sat inside a car in the 2400 block of 68th Avenue near his East Oakland home.

Later that night, officers were called at 8:11 p.m. to the intersection of 70th Avenue and Hawley Street for a report of shots fired. At the scene, officers found a man who had been shot at least once, who was dead at the scene, police said.

The name of the third fatal shooting victim has not been released pending notification of family, police said Monday.

Police and Crime Stoppers of Oakland are offering up to $10,000 in reward money for information leading to the arrest of the killers. Anyone with information can contact police at 510-238-3821 or Crime Stoppers at 510-777-8572 or 510-777-3211 or by email at Oaklandhomicide@oaklandnet.com.

Harry Harris contributed to this report. Contact Natalie Neysa Alund at 510-293-2469. Follow her at Twitter.com/nataliealund.