Fire investigators say clothing left near a lamp caused a Saturday afternoon fire at a house near the Kansas University campus.

Lawrence Douglas County Fire and Medical Division Chief Eve Tolefree said investigators determined the accidental fire caused an estimated $75,000 in damage — mainly to the upper floor unit at 1030 Ohio.

The house is divided into two units. Firefighters battled the blaze in 100-degree temperatures Saturday. None of the tenants was home during the fire.

Tolefree said one firefighter suffered a heat-related injury and two other firefighters were treated for abrasions. All three of the firefighters were treated and released from Lawrence Memorial Hospital, she said.

Jane Blocher, executive director of the Douglas County chapter of the American Red Cross, said the two tenants in the downstairs unit were in the process of moving, so a majority of their belongings were not inside. They declined help from the Red Cross.

Blocher was scheduled to meet Monday afternoon with the two residents of the upstairs unit. They have a place to stay and would likely receive Red Cross financial assistance for food and clothing.