One woman was injured and 20 residents of a McLean apartment complex were displaced last night by a fire that destroyed one unit and damaged several others.

The blaze at the Dolley Madison apartment complex in the 1800 block of Old Meadow Road began about 9:20 p.m., and was brought under control by Fairfax firefighters about 30 minutes later.

Theresa Lee, a resident of one of the 11 units in the building where the fire occurred, received burns on her hands and arms and was being treated last night at Fairfax Hospital.

About 50 firefighters responded to the blaze, which officials said caused at least $200,000 damage.

Another resident, James Robertson, said he was in his third-floor apartment watching a football game last night when "I saw smoke and stuff coming through the wall." Robertson, 26, said he made sure his wife, Kimberly, had made it outside, then went back to rescue the couple's three dogs from the smoke-filled building.

Cindy Phares, manager of the apartment complex, said that all 20 residents of the building that burned had been accounted for late last night.

She said vacant units elsewhere in the complex would be made available to those who were displaced and are not able to find other accommodations.

Fairfax fire officials said early this morning that they were still trying to determine what caused the blaze.

The fire was the third one in Fairfax County during the weekend. Two separate fires Saturday night damaged a private residence and a restaurant and displaced four residents, officials said.

Neither of the Saturday night blazes caused any injuries.

Neighbors reported seeing fire in a single-family house in the 6600 block of Moly Drive north of Falls Church about 10:37 p.m. Saturday. When firefighters arrived, the first floor was engulfed in flames that also reached into the second floor and basement, according to Sgt. Robert Rhoads.

Firefighters determined that no one was home at the time and extinguished the fire in about 20 minutes.

Rhoads said the fire, which caused about $60,000 worth of damage and sent the four adults who rented the house to stay with families, was started by a cardboard box of logs that was left too close to the fireplace.

Earlier in the evening, a grease buildup sparked a fire at the Chicken and Steak restaurant in the 5500 block of Leesburg Pike (Route 7) in Baileys Crossroads, Rhoads said.

About 35 patrons and employees fled the restaurant, which had $80,000 in damage and is closed pending repairs.