SOFIA (Reuters) - A gunman shot dead a 15-year-old girl and wounded two other children at a Bulgarian orphanage on Wednesday before killing himself, police said.

Police gave no explanation for the shooting by a 67-year-old man at the orphanage in Tran, a town 90 km (55 miles) west of Sofia.

The national radio and state news agency BTA quoted police officials as saying the man had been investigated over alleged sexual abuse of one of the wounded children. The dead girl had been summoned as a witness in the case.

The radio reported the man was a former supervisor who was fired from the orphanage over "heavy violations."

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(Reporting by Anna Mudeva; Editing by Stephen Weeks)