Three people, including a man and his grandson, have been shot dead at a Jewish community site and a retirement home in Kansas City in the US Midwest.
President Obama has pledged the full support of the federal government
The shootings occurred at the Jewish Community Campus at Overland Park and a nearby assisted living centre, Village Shalom, local media said.
Police said a suspect, a bearded white man in his 70s, was in custody.
A local hospital said it was treating a teenage boy for a gunshot wound and that he was in a critical condition.
Two victims were named by relatives as Dr William Lewis Corporan and his 14-year-old grandson, Reat Griffin Underwood.
They were killed in the car park of the Jewish Community Campus. They were both Christian.
A third, female victim was shot dead at Village Shalom, a retirement home several streets away from the community centre.
President Barack Obama called the shootings "heartbreaking" and pledged the full support of the federal government.