Four-year-old Serena Profitt died Monday at Doernbecher Children’s Hospital in Oregon, after being diagnosed with E. coli and a 6-year-old family friend is also sick.

Doctors, at this point, do not know the source of the E. coli.

The pastor said the families played “in a pond in the Lebanon area, playing in a river, and they did eat at a restaurant here in the Lincoln City area. The family has said the one thing those two children did that none of the other kids did was share a sandwich at this particular restaurant.”

The pastor did not name the restaurant.

Serena went into kidney failure and had a stroke Sunday night, KOIN 6 News learned. She suffered severe brain damage and died on Monday.

KOIN 6 News does not know the condition of the 6-year-old boy, who is reportedly being treated in the Tacoma area.