A four-year-old Albanian boy fired a gun at his one-year-old sister and killed her on Thursday in the southern town of Himara, Albanian Daily News reported Friday.

This tragedy "took place at the home of Karafilaj," where G. Karafilaj accidentally shot dead A. Karafilaj in the head, local police official Dhurata Karaj confirmed.

An investigation team has reached the scene to find out the circumstances that led to this unprecedented accident, police said.