Defence Minister Hulusi Akar, who visited the scene, said an investigation was underway. Four soldiers were killed and one was in intensive care, he said.
There were no reports of civilian casualties.
“These heroic aviation personnel of ours made an effort to make an emergency landing for reasons we do not yet know,” Akar told reporters at the scene. “It is understood that they made a great effort to do this without hurting anyone.”
The helicopter hit the roof of a four-storey apartment building as it attempted an emergency landing, Yerlikaya was quoted as saying by broadcaster NTV.