Newborn twins in Gaza were killed with their mother and grandmother as their father went to collect birth certificates earlier Tuesday.

Aysal, a girl, and brother Aser were born over the weekend and were just four days old when father Mohammed Abu al Qumsan left their home in Deir al Balah, central Gaza.

By the time he returned on Tuesday morning, with the certificates, his family had been killed in an Israeli airstrike.

According to local media, the family had been displaced from northern Gaza and had sheltered further south.

Video shared on social media shows the hysterical father being consoled by others, as someone holds what look like birth certificates.

His cries grow quieter and he appears to faint while two other men try to hold him up.