UPDATE 1-Blast rocks Silver Eagle Utah refinery

(Adds no injuries reported, site of fire)

HOUSTON, Nov 4 (Reuters) - An explosion rocked the 10,250 barrel-per-day Silver Eagle refinery near Salt Lake City, Utah, on Wednesday morning, according to local media reports.

Firefighters were battling the blaze at the refinery in Woods Cross, Utah, local television stations reported.

No injuries were reported in the first two hours after the explosion, which occurred at about 9:10 a.m. MST (1610 GMT).

The fire was thought to be burning in a hydrotreater unit, according to the reports. (Reporting by Erwin Seba; Editing by Walter Bagley)