HOUSTON (AP) - The Latest on fire burning at a Texas petrochemical facility (all times local):

11:30 a.m.

Officials say it's unclear how long it will take to extinguish a fire at a Houston-area petrochemicals storage facility where a large blaze is burning several storage tanks filled with gasoline components.

Harris County Fire Marshal Laurie Christensen said at a news conference Tuesday that she doesn't know how long it will take for the fire to burn itself out.

Officials previously said the fire at the Intercontinental Terminals Company facility in Deer Park could burn itself out by Wednesday. The fire started Sunday.

Authorities say a drop in water pressure caused the fire to intensify overnight and spread to additional storage tanks.

Company officials said Tuesday that five tanks are still burning and three have burned out. Two tanks that didn't have anything in them have collapsed.

9:40 a.m.

Authorities say a drop in water pressure caused a large fire at a Houston-area petrochemicals terminal to intensify overnight and spread to additional storage tanks.

The Deer Park Office of Emergency Management says the fire spread early Tuesday to two additional tanks, bringing to eight the total number of tanks overwhelmed by flames at Intercontinental Terminals Company in Deer Park, about 15 miles (24 kilometers) southeast of Houston.

Two of the tanks were empty but the others contain components of gasoline and materials used in nail polish remover, glues and paint thinner.

The water pressure later normalized and authorities say the fire could continue to burn for at least another day.

Students returned to classes Tuesday but outside activities will be restricted as the fire continues to emit a huge plume of smoke that can be seen for miles.

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