The death toll from a Georgia sugar refinery explosion has risen again.

A hospital spokeswoman in Augusta says another burn patient has died from injuries suffered in the blast at Imperial Sugar in Port Wentworth. That means 11 people have died since the Feb. 7 explosion.

Beth Frits of the Joseph M. Still Burn Center at Doctors Hospital says one of the hospital's 15 patients from the disaster died Saturday evening. Hospital officials declined to release the patient's name Sunday.

Investigators say the explosion was fueled by airborne sugar dust at the refinery near Savannah. But they have not yet determined what ignited it.

Fourteen other patients remain at the Augusta hospital Sunday. Twelve are in critical condition.