Half of the sextuplets born prematurely to a Minnesota couple have now died, hospital officials said Saturday.

A third boy, Lincoln Sean Morrison, died Friday. Two of his brothers, Tryg and Bennet, died earlier.

The three remaining babies remained in critical condition Saturday in the neonatal intensive care unit at Children's Hospital in Minneapolis.

Parents Ryan and Brianna Morrison released a statement saying it's been "a difficult week" for them, and thanking everyone for their prayers and support.

"We continue to trust in the Lord and are hopeful for a good outcome for Cadence, Lucia and Sylas," the statement said.

The four boys and two girls were born last Sunday about 4 1/2 months early.

Hospital officials say no further information would be released.