The Tulsa City-County Health Department is investigating at least four cases of E. coli infection – two confirmed and two suspected – three of which are linked to the same child-care program.

The two confirmed and one suspected case are children who attend a child-care program at the Boston Avenue United Methodist Church.

The two confirmed cases are siblings who have been hospitalized, according to the Health Department.

All of the children are younger than 10, Health Department spokeswoman Kaitlin Snider said.

Health officials said they cannot be certain that the church or its child-care program is the source of the infection.