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Eric Betts, Deseret News
A fire damaged a 12-unit apartment building in Holladay on Monday, March 19, 2012.

SALT LAKE CITY — An estimated 50-60 people were displaced Monday after two unrelated fires damaged apartment buildings in Holladay and Roy.

There was no evidence of fire on the outside of four apartment buildings at 1300 East near 4500 South in Holladay late Monday afternoon. But fire was burning in between the walls, officials said.

Unified Fire responded about 4 p.m. to a fire in one 12-unit apartment building. The fire began in the first floor in the walls separating apartments, Unified Fire Capt. Cliff Burningham said. The cause is under investigation

"It was downstairs," said Kory Hamilton, 28, an apartment resident. "It went through the walls, so everybody got damage. The smoke just flowed in."

Between 20 and 30 people were estimated to be displaced at the Holladay apartments, Burningham said. The Red Cross reported it was providing assistance to 19 people. The fire was declared extinguished just before 6 p.m.

In Roy, a large fire burned a 12-unit building at the Herfordshire Apartment complex at 4672 S. 1900 West. The cause of the fire is under investigation, and engines were still assigned to it through the night to ensure "it doesn't flare up," Roy Fire Department Investigative Sgt. Danny Hammon said.

The fire began shortly after 4 p.m. on the third floor, and all units are uninhabitable for fire or water damage, Hammon said. He estimates about 30 people have been displaced there.

There were no injuries reported from either fire.

Maxine Margaritis, CEO of American Red Cross Utah Region, said the organization was prepared to assist those displaced with food, clothing and shelter.

"With more than 1,200 volunteers across the state of Utah, we are fully equipped to respond to multiple emergencies simultaneously," Margaritis said.

E-mail: hschwarz@desnews.com